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Scientific Style and Format Citation Quick Guide

Scientific Style and Format presents three systems for referring to references (also known as citations) within the text of a journal article, book, or other scientific publication: 1) citation–sequence; 2) name–year; and 3) citation–name. These abbreviated references are called in-text references. They refer to a list of references at the end of the document.

The system of in-text references that you use will determine the order of references at the end of your document. These end references have essentially the same format in all three systems, except for the placement of the date of publication in the name–year system.

Though Scientific Style and Format now uses citation–sequence for its own references, each system is widely used in scientific publishing. Consult your publisher to determine which system you will need to follow.

Click on the tabs below for more information and to see some common examples of materials cited in each style, including examples of electronic sources. For numerous specific examples, see Chapter 29 of the 8th edition of Scientific Style and Format .

Citation–Sequence and Citation–Name

The following examples illustrate the citation–sequence and citation–name systems. The two systems are identical except for the order of references. In both systems, numbers within the text refer to the end references.

In citation–sequence, the end references are listed in the sequence in which they first appear within the text. For example, if a reference by Smith is the first one mentioned in the text, then the complete reference to the Smith work will be number 1 in the end references. The same number is used for subsequent in-text references to the same document.

In citation–name, the end references are listed alphabetically by author. Multiple works by the same author are listed alphabetically by title. The references are numbered in that sequence, such that a work authored by Adam is number 1, Brown is number 2, and so on. Numbers assigned to the end references are used for the in-text references regardless of the sequence in which they appear in the text of the work. For example, if a work by Zielinski is number 56 in the reference list, each in-text reference to Zielinski will be number 56 also.

List authors in the order in which they appear in the original text, followed by a period. Periods also follow article and journal title and volume or issue information. Separate the date from volume and issue by a semicolon. The location (usually the page range for the article) is preceded by a colon.

Author(s). Article title. Journal title. Date;volume(issue):location.

Journal titles are generally abbreviated according to the List of Title Word Abbreviations maintained by the ISSN International Centre. See Appendix 29.1 in Scientific Style and Format for more information.

For articles with more than 1 author, names are separated by a comma.

Smart N, Fang ZY, Marwick TH. A practical guide to exercise training for heart failure patients. J Card Fail. 2003;9(1):49–58.

For articles with more than 10 authors, list the first 10 followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 2002;22(2A):727–732.

Volume with no issue or other subdivision

Laskowski DA. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 2002;174:49–170.

Volume with issue and supplement

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. The natural history of tardive dyskinesia. J Clin Pharmacol. 1988;8(4 Suppl):31S–37S

Volume with supplement but no issue

Heemskerk J, Tobin AJ, Ravina B. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 2002;5 Suppl:1027–1029.

Multiple issue numbers

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 2002;1572(2–3):178–186.

Issue with no volume

Sabatier R. Reorienting health and social services. AIDS STD Health Promot Exch. 1995;(4):1–3.

Separate information about author(s), title, edition, and publication by periods. The basic format is as follows:

Author(s). Title. Edition. Place of publication: publisher; date. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional.

Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with more than 1 author, names are separated by a comma.

Ferrozzi F, Garlaschi G, Bova D. CT of metastases. New York (NY): Springer; 2000.

For books with more than 10 authors, list the first 10 followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US); 1995.

Organization as author

Advanced Life Support Group. Acute medical emergencies: the practical approach. London (England): BMJ Books; 2001.

Author(s) plus editor(s) or translator(s)

Klarsfeld A, Revah F. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press; 2003.

Luzikov VN. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau; 1985.

Chapter or other part of a book, same author(s)

Gawande A. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books; 2010. Chapter 3, The end of the master builder; p. 48–71.

Chapter or other part of a book, different authors

Rapley R. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press; 2010. p. 195–262.

Multivolume work as a whole

Alkire LG, editor. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale; 2006. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

Dissertations and Theses

Lutz M. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University; 1989.

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. Surgical stapling system. United States patent US 4,969,591. 1990 Nov 13.

Weiss R. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). 2003 Apr 11;Sect. A:12 (col. 1).

Indicate a copyright date with a lowercase “c”.

Johnson D, editor. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons; c2002. 1 DVD.

Websites and Other Online Formats

References to websites and other online formats follow the same general principles as for printed references, with the addition of a date of update/revision (if available) along with an access date and a URL.

Title of Homepage. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

If no date of publication can be determined, use a copyright date (if available), preceded by “c”. Include the URL in the notes.

APSnet: plant pathology. St Paul (MN): American Phytopathological Association; c1994–2005 [accessed 2005 Jun 20]. http://www.apsnet.org/.

Online journal article

Author(s) of article. Title of article. Title of journal (edition). Date of publication [date updated; date accessed];volume(issue):location. Notes.

A DOI (Digital Object Identifier) may be included in the notes in addition to a URL, if available:

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. 2005 [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

Author(s). Title of book. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. Polymicrobial diseases. Washington (DC): ASM Press; 2002 [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

Author’s name. Title of post [descriptive word]. Title of blog. Date of publication. [accessed date]. URL.

Fogarty M. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. 2012 Aug 14. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

Forthcoming or Unpublished Material

Not all forthcoming or unpublished sources are suitable for inclusion in reference lists. Check with your publisher if in doubt.

Forthcoming journal article or book

Journal article:

Farley T, Galves A, Dickinson LM, Perez MJ. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health. Forthcoming 2005 Jul.

Goldstein DS. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press. Forthcoming 2006.

Paper or poster presented at meeting

Unpublished presentations are cited as follows:

Antani S, Long LR, Thoma GR, Lee DJ. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; 2003 Sep 8–10; Benalmadena, Spain.

Charles L, Gordner R. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; 2005 May 14–19; San Antonio, TX.

References to published presentations are cited much like contributions to books, with the addition of information about the date and place of the conference. See Chapter 29 for more information.

Personal communication

References to personal communication are placed in running text rather than as formal end references.

Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

. . . and most of these meningiomas proved to be inoperable (2003 letter from RS Grant to me; unreferenced, see “Notes”) while a few were not.

Name–Year

The following examples illustrate the name–year system. In this system (sometimes called the Harvard system), in-text references consist of the surname of the author or authors and the year of publication of the document. End references are unnumbered and appear in alphabetical order by author and year of publication, with multiple works by the same author listed in chronological order.

Each example of an end reference is accompanied here by an example of a corresponding in-text reference. For more details and many more examples, see Chapter 29 of Scientific Style and Format .

For the end reference, list authors in the order in which they appear in the original text. The year of publication follows the author list. Use periods to separate each element, including author(s), date of publication, article and journal title, and volume or issue information. Location (usually the page range for the article) is preceded by a colon.

Author(s). Date. Article title. Journal title. Volume(issue):location.

For the in-text reference, use parentheses and list author(s) by surname followed by year of publication.

(Author(s) Year)

For articles with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Mazan MR, Hoffman AM. 2001. Effects of aerosolized albuterol on physiologic responses to exercise in standardbreds. Am J Vet Res. 62(11):1812–1817.

(Mazan and Hoffman 2001)

For articles with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Smart N, Fang ZY, Marwick TH. 2003. A practical guide to exercise training for heart failure patients. J Card Fail. 9(1):49–58.

(Smart et al. 2003)

For articles with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. 2002. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 22(2A):727–732.

(Pizzi et al. 2002)

Laskowski DA. 2002. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 174:49–170.

(Laskowski 2002)

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. 1988. The natural history of tardive dyskinesia. J Clin Pharmacol. 8(4 Suppl):31S–37S.

(Gardos et al. 1988)

Heemskerk J, Tobin AJ, Ravina B. 2002. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 5 Suppl:1027–1029.

(Heemskerk et al. 2002)

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. 2002. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 1572(2–3):178–186.

(Ramstrom et al. 2002)

Sabatier R. 1995. Reorienting health and social services. AIDS STD Health Promot Exch. (4):1–3.

(Sabatier 1995)

In the end reference, separate information about author(s), date, title, edition, and publication by periods. The basic format is as follows:

Author(s). Date. Title. Edition. Place of publication: publisher. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional. Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Leboffe MJ, Pierce BE. 2010. Microbiology: laboratory theory and application. Englewood (CO): Morton Publishing Company.

(Leboffe and Pierce 2010)

For books with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Ferrozzi F, Garlaschi G, Bova D. 2000. CT of metastases. New York (NY): Springer.

(Ferrozzi et al. 2000)

For books with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. 1995. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US).

(Wenger et al. 1995)

[ALSG] Advanced Life Support Group. 2001. Acute medical emergencies: the practical approach. London (England): BMJ Books.

(ALSG 2001)

Klarsfeld A, Revah F. 2003. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press.

Luzikov VN. 1985. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau.

(Klarsfeld and Revah 2003)

(Luzikov 1985)

Gawande A. 2010. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books. Chapter 3, The end of the master builder; p. 48–71.

(Gawande 2010)

Rapley R. 2010. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press. p. 195–262.

(Rapley 2010)

Alkire LG, editor. 2006. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

(Alkire 2006)

Lutz M. 1989. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University.

(Lutz 1989)

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. 1990 Nov 13. Surgical stapling system. United States patent US 4,969,591.

(Blanco et al. 1990)

Weiss R. 2003 Apr 11. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). Sect. A:12 (col. 1).

(Weiss 2003)

Johnson D, editor. c2002. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons. 1 DVD.

(Johnson c2002)

Format for end reference:

Title of Homepage. Date of publication. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

APSnet: plant pathology online. c1994–2005. St Paul (MN): American Phytopathological Association; [accessed 2005 Jun 20]. http://www.apsnet.org/.

For the in-text reference, include only the first word or two of the title (enough to distinguish it from other titles in the reference list), followed by an ellipsis.

(APSnet . . . c1994–2005)

Author(s) of article. Date of publication. Title of article. Title of journal (edition). [date updated; date accessed];Volume(issue):location. Notes.

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. 2005. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

(Savage et al. 2005)

Author(s). Date of publication. Title of book. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. 2002. Polymicrobial diseases. Washington (DC): ASM Press; [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

(Brogden and Guthmille 2002)

Author’s name. Date of publication. Title of post [descriptive word]. Title of blog. [accessed date]. URL.

Fogarty M. 2012 Aug 14. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

(Fogarty 2012)

Farley T, Galves A, Dickinson LM, Perez MJ. Forthcoming 2005 Jul. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health.

(Farley et al. 2005)

Goldstein DS. Forthcoming 2006. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press.

(Goldstein 2006)

Antani S, Long LR, Thoma GR, Lee DJ. 2003. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; Benalmadena, Spain.

Charles L, Gordner R. 2005. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; San Antonio, TX.

(Atani et al. 2003)

(Charles and Gordner 2005)

References to personal communication are placed in running text rather than as formal end references. Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

Scientific Style and Format, 8th Edition text © 2014 by the Council of Science Editors. Scientific Style and Format Online © 2014 by the Council of Science Editors.

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Citation Styles Guide | Examples for All Major Styles

Published on June 24, 2022 by Jack Caulfield . Revised on November 7, 2022.

A citation style is a set of guidelines on how to cite sources in your academic writing . You always need a citation whenever you quote , paraphrase , or summarize a source to avoid plagiarism . How you present these citations depends on the style you follow. Scribbr’s citation generator can help!

Different styles are set by different universities, academic associations, and publishers, often published in an official handbook with in-depth instructions and examples.

There are many different citation styles, but they typically use one of three basic approaches: parenthetical citations , numerical citations, or note citations.

Parenthetical citations

  • Chicago (Turabian) author-date

CSE name-year

Numerical citations

CSE citation-name or citation-sequence

Note citations

  • Chicago (Turabian) notes and bibliography

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Table of contents

Types of citation: parenthetical, note, numerical, which citation style should i use, parenthetical citation styles, numerical citation styles, note citation styles, frequently asked questions about citation styles.

The clearest identifying characteristic of any citation style is how the citations in the text are presented. There are three main approaches:

  • Parenthetical citations: You include identifying details of the source in parentheses in the text—usually the author’s last name and the publication date, plus a page number if relevant ( author-date ). Sometimes the publication date is omitted ( author-page ).
  • Numerical citations: You include a number in brackets or in superscript, which corresponds to an entry in your numbered reference list.
  • Note citations: You include a full citation in a footnote or endnote, which is indicated in the text with a superscript number or symbol.

Citation styles also differ in terms of how you format the reference list or bibliography entries themselves (e.g., capitalization, order of information, use of italics). And many style guides also provide guidance on more general issues like text formatting, punctuation, and numbers.

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In most cases, your university, department, or instructor will tell you which citation style you need to follow in your writing. If you’re not sure, it’s best to consult your institution’s guidelines or ask someone. If you’re submitting to a journal, they will usually require a specific style.

Sometimes, the choice of citation style may be left up to you. In those cases, you can base your decision on which citation styles are commonly used in your field. Try reading other articles from your discipline to see how they cite their sources, or consult the table below.

The American Anthropological Association (AAA) recommends citing your sources using Chicago author-date style . AAA style doesn’t have its own separate rules. This style is used in the field of anthropology.

APA Style is defined by the 7th edition of the Publication Manual of the American Psychological Association . It was designed for use in psychology, but today it’s widely used across various disciplines, especially in the social sciences.

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The citation style of the American Political Science Association (APSA) is used mainly in the field of political science.

The citation style of the American Sociological Association (ASA) is used primarily in the discipline of sociology.

Chicago author-date

Chicago author-date style is one of the two citation styles presented in the Chicago Manual of Style (17th edition). It’s used mainly in the sciences and social sciences.

The citation style of the Council of Science Editors (CSE) is used in various scientific disciplines. It includes multiple options for citing your sources, including the name-year system.

Harvard style is often used in the field of economics. It is also very widely used across disciplines in UK universities. There are various versions of Harvard style defined by different universities—it’s not a style with one definitive style guide.

Check out Scribbr’s Harvard Reference Generator

MLA style is the official style of the Modern Language Association, defined in the MLA Handbook (9th edition). It’s widely used across various humanities disciplines. Unlike most parenthetical citation styles, it’s author-page rather than author-date.

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The American Chemical Society (ACS) provides guidelines for a citation style using numbers in superscript or italics in the text, corresponding to entries in a numbered reference list at the end. It is used in chemistry.

The American Medical Association ( AMA ) provides guidelines for a numerical citation style using superscript numbers in the text, which correspond to entries in a numbered reference list. It is used in the field of medicine.

CSE style includes multiple options for citing your sources, including the citation-name and citation-sequence systems. Your references are listed alphabetically in the citation-name system; in the citation-sequence system, they appear in the order in which you cited them.

The Institute of Electrical and Electronics Engineers ( IEEE ) provides guidelines for citing your sources with IEEE in-text citations that consist of numbers enclosed in brackets, corresponding to entries in a numbered reference list. This style is used in various engineering and IT disciplines.

The National Library of Medicine (NLM) citation style is defined in Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers (2nd edition).

Vancouver style is also used in various medical disciplines. As with Harvard style, a lot of institutions and publications have their own versions of Vancouver—it doesn’t have one fixed style guide.

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references scientific paper

The Bluebook: A Uniform System of Citation is the main style guide for legal citations in the US. It’s widely used in law, and also when legal materials need to be cited in other disciplines.

Chicago notes and bibliography

Chicago notes and bibliography is one of the two citation styles presented in the Chicago Manual of Style (17th edition). It’s used mainly in the humanities.

The Oxford University Standard for the Citation of Legal Authorities ( OSCOLA ) is the main legal citation style in the UK (similar to Bluebook for the US).

There are many different citation styles used across different academic disciplines, but they fall into three basic approaches to citation:

  • Parenthetical citations : Including identifying details of the source in parentheses —usually the author’s last name and the publication date, plus a page number if available ( author-date ). The publication date is occasionally omitted ( author-page ).
  • Numerical citations: Including a number in brackets or superscript, corresponding to an entry in your numbered reference list.
  • Note citations: Including a full citation in a footnote or endnote , which is indicated in the text with a superscript number or symbol.

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

  • APA Style is the most popular citation style, widely used in the social and behavioral sciences.
  • MLA style is the second most popular, used mainly in the humanities.
  • Chicago notes and bibliography style is also popular in the humanities, especially history.
  • Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

A scientific citation style is a system of source citation that is used in scientific disciplines. Some commonly used scientific citation styles are:

  • Chicago author-date , CSE , and Harvard , used across various sciences
  • ACS , used in chemistry
  • AMA , NLM , and Vancouver , used in medicine and related disciplines
  • AAA , APA , and ASA , commonly used in the social sciences

APA format is widely used by professionals, researchers, and students in the social and behavioral sciences, including fields like education, psychology, and business.

Be sure to check the guidelines of your university or the journal you want to be published in to double-check which style you should be using.

MLA Style  is the second most used citation style (after APA ). It is mainly used by students and researchers in humanities fields such as literature, languages, and philosophy.

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Caulfield, J. (2022, November 07). Citation Styles Guide | Examples for All Major Styles. Scribbr. Retrieved February 18, 2024, from https://www.scribbr.com/citing-sources/citation-styles/

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Research Method

Home » References in Research – Types, Examples and Writing Guide

References in Research – Types, Examples and Writing Guide

Table of Contents

References in Research

References in Research

Definition:

References in research are a list of sources that a researcher has consulted or cited while conducting their study. They are an essential component of any academic work, including research papers, theses, dissertations, and other scholarly publications.

Types of References

There are several types of references used in research, and the type of reference depends on the source of information being cited. The most common types of references include:

References to books typically include the author’s name, title of the book, publisher, publication date, and place of publication.

Example: Smith, J. (2018). The Art of Writing. Penguin Books.

Journal Articles

References to journal articles usually include the author’s name, title of the article, name of the journal, volume and issue number, page numbers, and publication date.

Example: Johnson, T. (2021). The Impact of Social Media on Mental Health. Journal of Psychology, 32(4), 87-94.

Web sources

References to web sources should include the author or organization responsible for the content, the title of the page, the URL, and the date accessed.

Example: World Health Organization. (2020). Coronavirus disease (COVID-19) advice for the public. Retrieved from https://www.who.int/emergencies/disease/novel-coronavirus-2019/advice-for-public

Conference Proceedings

References to conference proceedings should include the author’s name, title of the paper, name of the conference, location of the conference, date of the conference, and page numbers.

Example: Chen, S., & Li, J. (2019). The Future of AI in Education. Proceedings of the International Conference on Educational Technology, Beijing, China, July 15-17, pp. 67-78.

References to reports typically include the author or organization responsible for the report, title of the report, publication date, and publisher.

Example: United Nations. (2020). The Sustainable Development Goals Report. United Nations.

Formats of References

Some common Formates of References with their examples are as follows:

APA (American Psychological Association) Style

The APA (American Psychological Association) Style has specific guidelines for formatting references used in academic papers, articles, and books. Here are the different reference formats in APA style with examples:

Author, A. A. (Year of publication). Title of book. Publisher.

Example : Smith, J. K. (2005). The psychology of social interaction. Wiley-Blackwell.

Journal Article

Author, A. A., Author, B. B., & Author, C. C. (Year of publication). Title of article. Title of Journal, volume number(issue number), page numbers.

Example : Brown, L. M., Keating, J. G., & Jones, S. M. (2012). The role of social support in coping with stress among African American adolescents. Journal of Research on Adolescence, 22(1), 218-233.

Author, A. A. (Year of publication or last update). Title of page. Website name. URL.

Example : Centers for Disease Control and Prevention. (2020, December 11). COVID-19: How to protect yourself and others. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html

Magazine article

Author, A. A. (Year, Month Day of publication). Title of article. Title of Magazine, volume number(issue number), page numbers.

Example : Smith, M. (2019, March 11). The power of positive thinking. Psychology Today, 52(3), 60-65.

Newspaper article:

Author, A. A. (Year, Month Day of publication). Title of article. Title of Newspaper, page numbers.

Example: Johnson, B. (2021, February 15). New study shows benefits of exercise on mental health. The New York Times, A8.

Edited book

Editor, E. E. (Ed.). (Year of publication). Title of book. Publisher.

Example : Thompson, J. P. (Ed.). (2014). Social work in the 21st century. Sage Publications.

Chapter in an edited book:

Author, A. A. (Year of publication). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. page numbers). Publisher.

Example : Johnson, K. S. (2018). The future of social work: Challenges and opportunities. In J. P. Thompson (Ed.), Social work in the 21st century (pp. 105-118). Sage Publications.

MLA (Modern Language Association) Style

The MLA (Modern Language Association) Style is a widely used style for writing academic papers and essays in the humanities. Here are the different reference formats in MLA style:

Author’s Last name, First name. Title of Book. Publisher, Publication year.

Example : Smith, John. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Journal article

Author’s Last name, First name. “Title of Article.” Title of Journal, volume number, issue number, Publication year, page numbers.

Example : Brown, Laura M., et al. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence, vol. 22, no. 1, 2012, pp. 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name, Publication date, URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC, 11 Dec. 2020, https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date, page numbers.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, Mar. 2019, pp. 60-65.

Newspaper article

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date, page numbers.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, 15 Feb. 2021, p. A8.

Editor’s Last name, First name, editor. Title of Book. Publisher, Publication year.

Example : Thompson, John P., editor. Social Work in the 21st Century. Sage Publications, 2014.

Chapter in an edited book

Author’s Last name, First name. “Title of Chapter.” Title of Book, edited by Editor’s First Name Last name, Publisher, Publication year, page numbers.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” Social Work in the 21st Century, edited by John P. Thompson, Sage Publications, 2014, pp. 105-118.

Chicago Manual of Style

The Chicago Manual of Style is a widely used style for writing academic papers, dissertations, and books in the humanities and social sciences. Here are the different reference formats in Chicago style:

Example : Smith, John K. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Publication year): page numbers.

Example : Brown, Laura M., John G. Keating, and Sarah M. Jones. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name. Publication date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Example : Thompson, John P., ed. Social Work in the 21st Century. Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Publisher, Publication year.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Sage Publications, 2014.

Harvard Style

The Harvard Style, also known as the Author-Date System, is a widely used style for writing academic papers and essays in the social sciences. Here are the different reference formats in Harvard Style:

Author’s Last name, First name. Year of publication. Title of Book. Place of publication: Publisher.

Example : Smith, John. 2005. The Psychology of Social Interaction. Oxford: Wiley-Blackwell.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Journal volume number (issue number): page numbers.

Example: Brown, Laura M., John G. Keating, and Sarah M. Jones. 2012. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22 (1): 218-233.

Author’s Last name, First name. Year of publication. “Title of Webpage.” Website Name. URL. Accessed date.

Example : Centers for Disease Control and Prevention. 2020. “COVID-19: How to Protect Yourself and Others.” CDC. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html. Accessed April 1, 2023.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Magazine, month and date of publication.

Example : Smith, Mary. 2019. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Newspaper, month and date of publication.

Example : Johnson, Bob. 2021. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Year of publication. Title of Book. Place of publication: Publisher.

Example : Thompson, John P., ed. 2014. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications.

Author’s Last name, First name. Year of publication. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Place of publication: Publisher.

Example : Johnson, Karen S. 2014. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Thousand Oaks, CA: Sage Publications.

Vancouver Style

The Vancouver Style, also known as the Uniform Requirements for Manuscripts Submitted to Biomedical Journals, is a widely used style for writing academic papers in the biomedical sciences. Here are the different reference formats in Vancouver Style:

Author’s Last name, First name. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. 2nd ed. Oxford: Wiley-Blackwell; 2005.

Author’s Last name, First name. Title of Article. Abbreviated Journal Title. Year of publication; volume number(issue number):page numbers.

Example : Brown LM, Keating JG, Jones SM. The Role of Social Support in Coping with Stress among African American Adolescents. J Res Adolesc. 2012;22(1):218-233.

Author’s Last name, First name. Title of Webpage. Website Name [Internet]. Publication date. [cited date]. Available from: URL.

Example : Centers for Disease Control and Prevention. COVID-19: How to Protect Yourself and Others [Internet]. 2020 Dec 11. [cited 2023 Apr 1]. Available from: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. Title of Article. Title of Magazine. Year of publication; month and day of publication:page numbers.

Example : Smith M. The Power of Positive Thinking. Psychology Today. 2019 Mar 1:32-35.

Author’s Last name, First name. Title of Article. Title of Newspaper. Year of publication; month and day of publication:page numbers.

Example : Johnson B. New Study Shows Benefits of Exercise on Mental Health. The New York Times. 2021 Feb 15:A4.

Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014.

Author’s Last name, First name. Title of Chapter. In: Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication. page numbers.

Example : Johnson KS. The Future of Social Work: Challenges and Opportunities. In: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014. p. 105-118.

Turabian Style

Turabian style is a variation of the Chicago style used in academic writing, particularly in the fields of history and humanities. Here are the different reference formats in Turabian style:

Author’s Last name, First name. Title of Book. Place of publication: Publisher, Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. Oxford: Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Year of publication): page numbers.

Example : Brown, LM, Keating, JG, Jones, SM. “The Role of Social Support in Coping with Stress among African American Adolescents.” J Res Adolesc 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Publication date. Accessed date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. Accessed April 1, 2023. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Month Day, Year of publication, page numbers.

Example : Smith, M. “The Power of Positive Thinking.” Psychology Today, March 1, 2019, 32-35.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Month Day, Year of publication.

Example : Johnson, B. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Title of Book. Place of publication: Publisher, Year of publication.

Example : Thompson, JP, ed. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s Last name, First name, page numbers. Place of publication: Publisher, Year of publication.

Example : Johnson, KS. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by Thompson, JP, 105-118. Thousand Oaks, CA: Sage Publications, 2014.

IEEE (Institute of Electrical and Electronics Engineers) Style

IEEE (Institute of Electrical and Electronics Engineers) style is commonly used in engineering, computer science, and other technical fields. Here are the different reference formats in IEEE style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of publication.

Example : Oppenheim, A. V., & Schafer, R. W. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 2010.

Author’s Last name, First name. “Title of Article.” Abbreviated Journal Title, vol. number, no. issue number, pp. page numbers, Month year of publication.

Example: Shannon, C. E. “A Mathematical Theory of Communication.” Bell System Technical Journal, vol. 27, no. 3, pp. 379-423, July 1948.

Conference paper

Author’s Last name, First name. “Title of Paper.” In Title of Conference Proceedings, Place of Conference, Date of Conference, pp. page numbers, Year of publication.

Example: Gupta, S., & Kumar, P. “An Improved System of Linear Discriminant Analysis for Face Recognition.” In Proceedings of the 2011 International Conference on Computer Science and Network Technology, Harbin, China, Dec. 2011, pp. 144-147.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Date of publication or last update. Accessed date. URL.

Example : National Aeronautics and Space Administration. “Apollo 11.” NASA. July 20, 1969. Accessed April 1, 2023. https://www.nasa.gov/mission_pages/apollo/apollo11.html.

Technical report

Author’s Last name, First name. “Title of Report.” Name of Institution or Organization, Report number, Year of publication.

Example : Smith, J. R. “Development of a New Solar Panel Technology.” National Renewable Energy Laboratory, NREL/TP-6A20-51645, 2011.

Author’s Last name, First name. “Title of Patent.” Patent number, Issue date.

Example : Suzuki, H. “Method of Producing Carbon Nanotubes.” US Patent 7,151,019, December 19, 2006.

Standard Title. Standard number, Publication date.

Example : IEEE Standard for Floating-Point Arithmetic. IEEE Std 754-2008, August 29, 2008

ACS (American Chemical Society) Style

ACS (American Chemical Society) style is commonly used in chemistry and related fields. Here are the different reference formats in ACS style:

Author’s Last name, First name; Author’s Last name, First name. Title of Article. Abbreviated Journal Title Year, Volume, Page Numbers.

Example : Wang, Y.; Zhao, X.; Cui, Y.; Ma, Y. Facile Preparation of Fe3O4/graphene Composites Using a Hydrothermal Method for High-Performance Lithium Ion Batteries. ACS Appl. Mater. Interfaces 2012, 4, 2715-2721.

Author’s Last name, First name. Book Title; Publisher: Place of Publication, Year of Publication.

Example : Carey, F. A. Organic Chemistry; McGraw-Hill: New York, 2008.

Author’s Last name, First name. Chapter Title. In Book Title; Editor’s Last name, First name, Ed.; Publisher: Place of Publication, Year of Publication; Volume number, Chapter number, Page Numbers.

Example : Grossman, R. B. Analytical Chemistry of Aerosols. In Aerosol Measurement: Principles, Techniques, and Applications; Baron, P. A.; Willeke, K., Eds.; Wiley-Interscience: New York, 2001; Chapter 10, pp 395-424.

Author’s Last name, First name. Title of Webpage. Website Name, URL (accessed date).

Example : National Institute of Standards and Technology. Atomic Spectra Database. https://www.nist.gov/pml/atomic-spectra-database (accessed April 1, 2023).

Author’s Last name, First name. Patent Number. Patent Date.

Example : Liu, Y.; Huang, H.; Chen, H.; Zhang, W. US Patent 9,999,999, December 31, 2022.

Author’s Last name, First name; Author’s Last name, First name. Title of Article. In Title of Conference Proceedings, Publisher: Place of Publication, Year of Publication; Volume Number, Page Numbers.

Example : Jia, H.; Xu, S.; Wu, Y.; Wu, Z.; Tang, Y.; Huang, X. Fast Adsorption of Organic Pollutants by Graphene Oxide. In Proceedings of the 15th International Conference on Environmental Science and Technology, American Chemical Society: Washington, DC, 2017; Volume 1, pp 223-228.

AMA (American Medical Association) Style

AMA (American Medical Association) style is commonly used in medical and scientific fields. Here are the different reference formats in AMA style:

Author’s Last name, First name. Article Title. Journal Abbreviation. Year; Volume(Issue):Page Numbers.

Example : Jones, R. A.; Smith, B. C. The Role of Vitamin D in Maintaining Bone Health. JAMA. 2019;321(17):1765-1773.

Author’s Last name, First name. Book Title. Edition number. Place of Publication: Publisher; Year.

Example : Guyton, A. C.; Hall, J. E. Textbook of Medical Physiology. 13th ed. Philadelphia, PA: Saunders; 2015.

Author’s Last name, First name. Chapter Title. In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: Page Numbers.

Example: Rajakumar, K. Vitamin D and Bone Health. In: Holick, M. F., ed. Vitamin D: Physiology, Molecular Biology, and Clinical Applications. 2nd ed. New York, NY: Springer; 2010:211-222.

Author’s Last name, First name. Webpage Title. Website Name. URL. Published date. Updated date. Accessed date.

Example : National Cancer Institute. Breast Cancer Prevention (PDQ®)–Patient Version. National Cancer Institute. https://www.cancer.gov/types/breast/patient/breast-prevention-pdq. Published October 11, 2022. Accessed April 1, 2023.

Author’s Last name, First name. Conference presentation title. In: Conference Title; Conference Date; Place of Conference.

Example : Smith, J. R. Vitamin D and Bone Health: A Meta-Analysis. In: Proceedings of the Annual Meeting of the American Society for Bone and Mineral Research; September 20-23, 2022; San Diego, CA.

Thesis or dissertation

Author’s Last name, First name. Title of Thesis or Dissertation. Degree level [Doctoral dissertation or Master’s thesis]. University Name; Year.

Example : Wilson, S. A. The Effects of Vitamin D Supplementation on Bone Health in Postmenopausal Women [Doctoral dissertation]. University of California, Los Angeles; 2018.

ASCE (American Society of Civil Engineers) Style

The ASCE (American Society of Civil Engineers) style is commonly used in civil engineering fields. Here are the different reference formats in ASCE style:

Author’s Last name, First name. “Article Title.” Journal Title, volume number, issue number (year): page numbers. DOI or URL (if available).

Example : Smith, J. R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering, vol. 146, no. 3 (2020): 04020010. https://doi.org/10.1061/(ASCE)EE.1943-7870.0001668.

Example : McCuen, R. H. Hydrologic Analysis and Design. 4th ed. Upper Saddle River, NJ: Pearson Education; 2013.

Author’s Last name, First name. “Chapter Title.” In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: page numbers.

Example : Maidment, D. R. “Floodplain Management in the United States.” In: Shroder, J. F., ed. Treatise on Geomorphology. San Diego, CA: Academic Press; 2013: 447-460.

Author’s Last name, First name. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year: page numbers.

Example: Smith, J. R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019: 156-163.

Author’s Last name, First name. “Report Title.” Report number. Place of Publication: Publisher; Year.

Example : U.S. Army Corps of Engineers. “Hurricane Sandy Coastal Risk Reduction Program, New York and New Jersey.” Report No. P-15-001. Washington, DC: U.S. Army Corps of Engineers; 2015.

CSE (Council of Science Editors) Style

The CSE (Council of Science Editors) style is commonly used in the scientific and medical fields. Here are the different reference formats in CSE style:

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Year;Volume(Issue):Page numbers.

Example : Smith, J.R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering. 2020;146(3):04020010.

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number. Place of Publication: Publisher; Year.

Author’s Last name, First Initial. Middle Initial. “Chapter Title.” In: Editor’s Last name, First Initial. Middle Initial., ed. Book Title. Edition number. Place of Publication: Publisher; Year:Page numbers.

Author’s Last name, First Initial. Middle Initial. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year.

Example : Smith, J.R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019.

Author’s Last name, First Initial. Middle Initial. “Report Title.” Report number. Place of Publication: Publisher; Year.

Bluebook Style

The Bluebook style is commonly used in the legal field for citing legal documents and sources. Here are the different reference formats in Bluebook style:

Case citation

Case name, volume source page (Court year).

Example : Brown v. Board of Education, 347 U.S. 483 (1954).

Statute citation

Name of Act, volume source § section number (year).

Example : Clean Air Act, 42 U.S.C. § 7401 (1963).

Regulation citation

Name of regulation, volume source § section number (year).

Example: Clean Air Act, 40 C.F.R. § 52.01 (2019).

Book citation

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number (if applicable). Place of Publication: Publisher; Year.

Example: Smith, J.R. Legal Writing and Analysis. 3rd ed. New York, NY: Aspen Publishers; 2015.

Journal article citation

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Volume number (year): first page-last page.

Example: Garcia, C. “The Right to Counsel: An International Comparison.” International Journal of Legal Information. 43 (2015): 63-94.

Website citation

Author’s Last name, First Initial. Middle Initial. “Page Title.” Website Title. URL (accessed month day, year).

Example : United Nations. “Universal Declaration of Human Rights.” United Nations. https://www.un.org/en/universal-declaration-human-rights/ (accessed January 3, 2023).

Oxford Style

The Oxford style, also known as the Oxford referencing system or the documentary-note citation system, is commonly used in the humanities, including literature, history, and philosophy. Here are the different reference formats in Oxford style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of Publication.

Example : Smith, John. The Art of Writing. New York: Penguin, 2020.

Author’s Last name, First name. “Article Title.” Journal Title volume, no. issue (year): page range.

Example: Garcia, Carlos. “The Role of Ethics in Philosophy.” Philosophy Today 67, no. 3 (2019): 53-68.

Chapter in an edited book citation

Author’s Last name, First name. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher, Year of Publication.

Example : Lee, Mary. “Feminism in the 21st Century.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press, 2018.

Author’s Last name, First name. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed 3 January 2023).

Dissertation or thesis citation

Author’s Last name, First name. “Title of Dissertation/Thesis.” PhD diss., University Name, Year of Publication.

Example : Brown, Susan. “The Art of Storytelling in American Literature.” PhD diss., University of Oxford, 2020.

Newspaper article citation

Author’s Last name, First name. “Article Title.” Newspaper Title, Month Day, Year.

Example : Robinson, Andrew. “New Developments in Climate Change Research.” The Guardian, September 15, 2022.

AAA (American Anthropological Association) Style

The American Anthropological Association (AAA) style is commonly used in anthropology research papers and journals. Here are the different reference formats in AAA style:

Author’s Last name, First name. Year of Publication. Book Title. Place of Publication: Publisher.

Example : Smith, John. 2019. The Anthropology of Food. New York: Routledge.

Author’s Last name, First name. Year of Publication. “Article Title.” Journal Title volume, no. issue: page range.

Example : Garcia, Carlos. 2021. “The Role of Ethics in Anthropology.” American Anthropologist 123, no. 2: 237-251.

Author’s Last name, First name. Year of Publication. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher.

Example: Lee, Mary. 2018. “Feminism in Anthropology.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press.

Author’s Last name, First name. Year of Publication. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. 2020. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed January 3, 2023).

Author’s Last name, First name. Year of Publication. “Title of Dissertation/Thesis.” PhD diss., University Name.

Example : Brown, Susan. 2022. “The Art of Storytelling in Anthropology.” PhD diss., University of California, Berkeley.

Author’s Last name, First name. Year of Publication. “Article Title.” Newspaper Title, Month Day.

Example : Robinson, Andrew. 2021. “New Developments in Anthropology Research.” The Guardian, September 15.

AIP (American Institute of Physics) Style

The American Institute of Physics (AIP) style is commonly used in physics research papers and journals. Here are the different reference formats in AIP style:

Example : Johnson, S. D. 2021. “Quantum Computing and Information.” Journal of Applied Physics 129, no. 4: 043102.

Example : Feynman, Richard. 2018. The Feynman Lectures on Physics. New York: Basic Books.

Example : Jones, David. 2020. “The Future of Quantum Computing.” In The Handbook of Physics, edited by John Smith, 125-136. Oxford: Oxford University Press.

Conference proceedings citation

Author’s Last name, First name. Year of Publication. “Title of Paper.” Proceedings of Conference Name, date and location: page range. Place of Publication: Publisher.

Example : Chen, Wei. 2019. “The Applications of Nanotechnology in Solar Cells.” Proceedings of the 8th International Conference on Nanotechnology, July 15-17, Tokyo, Japan: 224-229. New York: AIP Publishing.

Example : American Institute of Physics. 2022. “About AIP Publishing.” AIP Publishing. https://publishing.aip.org/about-aip-publishing/ (accessed January 3, 2023).

Patent citation

Author’s Last name, First name. Year of Publication. Patent Number.

Example : Smith, John. 2018. US Patent 9,873,644.

References Writing Guide

Here are some general guidelines for writing references:

  • Follow the citation style guidelines: Different disciplines and journals may require different citation styles (e.g., APA, MLA, Chicago). It is important to follow the specific guidelines for the citation style required.
  • Include all necessary information : Each citation should include enough information for readers to locate the source. For example, a journal article citation should include the author(s), title of the article, journal title, volume number, issue number, page numbers, and publication year.
  • Use proper formatting: Citation styles typically have specific formatting requirements for different types of sources. Make sure to follow the proper formatting for each citation.
  • Order citations alphabetically: If listing multiple sources, they should be listed alphabetically by the author’s last name.
  • Be consistent: Use the same citation style throughout the entire paper or project.
  • Check for accuracy: Double-check all citations to ensure accuracy, including correct spelling of author names and publication information.
  • Use reputable sources: When selecting sources to cite, choose reputable and authoritative sources. Avoid sources that are biased or unreliable.
  • Include all sources: Make sure to include all sources used in the research, including those that were not directly quoted but still informed the work.
  • Use online tools : There are online tools available (e.g., citation generators) that can help with formatting and organizing references.

Purpose of References in Research

References in research serve several purposes:

  • To give credit to the original authors or sources of information used in the research. It is important to acknowledge the work of others and avoid plagiarism.
  • To provide evidence for the claims made in the research. References can support the arguments, hypotheses, or conclusions presented in the research by citing relevant studies, data, or theories.
  • To allow readers to find and verify the sources used in the research. References provide the necessary information for readers to locate and access the sources cited in the research, which allows them to evaluate the quality and reliability of the information presented.
  • To situate the research within the broader context of the field. References can show how the research builds on or contributes to the existing body of knowledge, and can help readers to identify gaps in the literature that the research seeks to address.

Importance of References in Research

References play an important role in research for several reasons:

  • Credibility : By citing authoritative sources, references lend credibility to the research and its claims. They provide evidence that the research is based on a sound foundation of knowledge and has been carefully researched.
  • Avoidance of Plagiarism : References help researchers avoid plagiarism by giving credit to the original authors or sources of information. This is important for ethical reasons and also to avoid legal repercussions.
  • Reproducibility : References allow others to reproduce the research by providing detailed information on the sources used. This is important for verification of the research and for others to build on the work.
  • Context : References provide context for the research by situating it within the broader body of knowledge in the field. They help researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
  • Evaluation : References provide a means for others to evaluate the research by allowing them to assess the quality and reliability of the sources used.

Advantages of References in Research

There are several advantages of including references in research:

  • Acknowledgment of Sources: Including references gives credit to the authors or sources of information used in the research. This is important to acknowledge the original work and avoid plagiarism.
  • Evidence and Support : References can provide evidence to support the arguments, hypotheses, or conclusions presented in the research. This can add credibility and strength to the research.
  • Reproducibility : References provide the necessary information for others to reproduce the research. This is important for the verification of the research and for others to build on the work.
  • Context : References can help to situate the research within the broader body of knowledge in the field. This helps researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
  • Evaluation : Including references allows others to evaluate the research by providing a means to assess the quality and reliability of the sources used.
  • Ongoing Conversation: References allow researchers to engage in ongoing conversations and debates within their fields. They can show how the research builds on or contributes to the existing body of knowledge.

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Research Methodology and Scientific Writing pp 361–400 Cite as

References: How to Cite and List Correctly

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When we write an essay, research paper, thesis, or book, it is normal to include information from the work of others or support our arguments by reference to other published works. All such academic documents draw heavily on the ideas and findings of previous and current researchers available through various sources such as books, journals, theses, newspapers, magazines, government reports, or Internet sources. In all these cases, proper referencing is essential in order to ensure easy retrieval of information. Referencing is the name given to the method of showing and acknowledging the sources from which the author has obtained ideas or information.

Everything deep is also simple and can be reproduced simply as long as its reference to the whole truth is maintained. But what matters is not what is witty but what is true. Albert Schweitzer (1875–1965)

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Table of Contents

Every scientific paper builds on previous research – even if it’s in a new field, related studies will have preceded and informed it. In peer-reviewed articles, authors must give credit to this previous research, through citations and references. Not only does this show clearly where the current research came from, but it also helps readers understand the content of the paper better.

There is no optimum number of references for an academic article but depending on the subject you could be dealing with more than 100 different papers, conference reports, video articles, medical guidelines or any number of other resources.

That’s a lot of content to manage. Before submitting your manuscript, this needs to be checked, cross-references in the text and the list, organized and formatted.

The exact content and format of the citations and references in your paper will depend on the journal you aim to publish in, so the first step is to check the journal’s Guide for Authors before you submit.

There are two main points to pay attention to – consistency and accuracy. When you go through your manuscript to edit or proofread it, look closely at the citations within the text. Are they all the same? For example, if the journal prefers the citations to be in the format (name, year), make sure they’re all the same: (Smith, 2016).

Your citations must also be accurate and complete. Do they match your references list? Each citation should be included in the list, so cross-checking is important. It’s also common for journals to prefer that most, if not all, of the articles listed in your references be cited within the text – after all, these should be studies that contributed to the knowledge underpinning your work, not just your bedtime reading. So go through them carefully, noting any missing references or citations and filling the gaps.

Each journal has its own requirements when it comes to the content and format of references, as well as where and how you should include them in your submission, so double-check before you hit send!

In general, a reference will include authors’ names and initials, the title of the article, name of the journal, volume and issue, date, page numbers and DOI. On ScienceDirect, articles are linked to their original source (if also published on ScienceDirect) or to their Scopus record, so including the DOI can help link to the correct article.

A spotless reference list

Luckily, compiling and editing the references in your scientific manuscript can be easy – and it no longer has to be manual. Management tools like Mendeley can keep track of all your references, letting you share them with your collaborators. With the Word plugin, it’s possible to select the right citation style for the journal you’re submitting to and the tool will format your references automatically.

Like with any other part of your manuscript, it’s important to make sure your reference list has been checked and edited. Elsevier Author Services Language Editing can help, with professional manuscript editing that will help make sure your references don’t hold you back from publication.

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When you use ideas that are not your own, it is important to credit or cite the author(s) or source, even if you do not quote their idea or words exactly as written. Citing your sources allows your reader to identify the works you have consulted and to understand the scope of your research. There are many different citation styles available. You may be required to use a particular style or you may choose one.

One of the commonly used styles is the APA (American Psychological Association) Style.

APA style stipulates that authors use brief references in the text of a work with full bibliographic details supplied in a Reference List (typically at the end of your document). In text, the reference is very brief and usually consists simply of the author's last name and a date.For example:

...Sheep milk has been proved to contain more nutrients than cow milk (Johnson, 2005).

In a Reference list, the reference contains full bibliographic details written in a format that depends on the type of reference. Examples of formats for some common types of references are listed below. For additional information, visit the University of Arkansas libraries webpage on citing your sources . Another useful web-site on this topic is here.

Author last name, Author First Initial. Author Second Initial. (Publication Year). Title of article. Title of Journal, volume(issue) (if issue numbered), pages.

Bass, M. A., Enochs, W. K., & DiBrezzo, R. (2002). Comparison of two exercise programs on general well-being of college students. Psychological Reports, 91(3), 1195-1201.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. (Vol. number, pp. pages). Place: Publisher.

"Ivory-billed woodpecker." (2002). In The new encyclopædia britannica. (Vol. 5, p. ). 15th ed. Chicago: Encyclopædia Britannica.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. Retrieved from (database name or URL).

Ivory-billed woodpecker. (2006). In Encyclopædia britannica online. Retrieved from http://search.eb.com/eb/article-9043081

Author last name, Author First Initial. Author Second Initial. (Publication Year, Month Day). Title of article. Title of Magazine,volume, pages.

Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23.

Author last name, Author First Initial. Author Second Initial. (Publication Year, Month Day). Title of article. Title of Magazine. volume, pages. Retrieved from (database name or URL).

Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23. Retrieved from Academic Search Premier database.

Page Author Last Name, Page Author First Initial. Page Author Second Initial. Page title [nature of work - web site, blog, forum posting, etc.]. (Publication Year). Retrieved from (URL)

Sabo, G., et al. Rock art in Arkansas [Web site]. (2001). Retrieved from http://arkarcheology.uark.edu/rockart/index.html

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What citation style to use for science [Updated 2023]

Top citation styles used in science

What citation style should you use for a science paper? In this post, we explore the most frequently used citation styles for science. We cover APA, IEEE, ACS, and others and provide examples of each style.

APA is the number one citation style used in science

APA (American Psychological Association) style is a citation format used in the social sciences, education, and engineering, as well as in the sciences. APA consists of two elements: in-text citations and a reference list.

It uses an author-date system, in which the author’s last name and year of publication are put in parentheses (e.g. Smith 2003). These parenthetical citations refer the reader to a list at the end of the paper, which includes information about each source.

APA style resources

🌐 Official APA style guidelines

🗂 APA style guide

📝 APA citation generator

APA style examples

Here is an example of an in-text citation in APA style:

In recent years, much debate has been stirred regarding volcanic soil (Avşar et al., 2018) .

Here is a bibliography entry in APA style:

Avşar, E., Ulusay, R., Aydan, Ö., & Mutlutürk, M . ( 2015 ). On the Difficulties of Geotechnical Sampling and practical Estimates of the Strength of a weakly bonded Volcanic Soil . Bulletin of Engineering Geology and the Environment , 74 ( 4 ), 1375–1394 . https://doi.org/10.1007/s10064-014-0710-9

Chicago is the number two citation style used in science

Chicago style is another form of citation used for science papers and journals. It has two formats: a notes and bibliography system and an author-date system.

The notes and bibliography system is mostly used for the humanities, whereas the author-date system is used in science and business. The latter uses in-text citations formed by the author's last name and date of publication. A bibliography at the end of the paper lists the full information for all references.

Chicago style resources

🌐 Official Chicago style guidelines

🗂 Chicago style guide

📝 Chicago citation generator

Chicago style examples

Here is an in-text citation in Chicago style:

However, a research proved this theory right (Hofman and Rick 2018, 65-115) .

Here is a bibliography entry in Chicago style:

Hofman, Courtney A., and Torben C. Rick . “ Ancient Biological Invasions and Island Ecosystems: Tracking Translocations of Wild Plants and Animals .” Journal of Archaeological Research 26 , no. 1 ( 2018 ): 65–115 . doi.org/10.1007/s10814-017-9105-3 .

CSE is the number three citation style used in science

CSE style is the standard format used in the physical and life sciences. This style features three types of citation systems: citation-sequence, name-year, and citation-name.

• Name-Year : In-text citations of this type feature the author’s last name and the year of publication in brackets. A bibliography at the end lists all references in full.

• Citation-Sequence : Every source is assigned a superscript number that is used as an in-text reference. The bibliography at the end lists all numbers with their references in the order in which they appeared in the text.

• Citation-Name : The reference list is organized alphabetically by authors’ last names; each name is assigned a number which can be placed in superscript as an in-text reference.

CSE style resources

🌐 Official CSE style guidelines

📝 CSE citation generator

CSE style examples

Here is an example of an in-text citation in CSE name-year style:

Therefore, the translocation of wild plants was tracked (Hofman and Rick 2018) .

Here is a bibliography entry in CSE name-year style:

Hofman CA, Rick TC. 2018. Ancient Biological Invasions and Island Ecosystems: Tracking Translocations of Wild Plants and Animals. J. Archaeol. [accessed 2019 Mar 11]; 26(1): 65–11. doi.org/10.1007/s10814-017-9105-3.

AIP is the number four citation style used in science

AIP style, as its title suggests, is commonly applied in physics and astronomy papers. This style has a numbered citation system , which uses superscript numbers to show in-text citations. These numbers correspond to a list of sources at the end of the paper.

AIP style resources

🌐 Official AIP style guidelines

🗂 AIP style guide

📝 AIP citation generator

AIP style examples

Here is an in-text citation in AIP style:

A similar study was carried out in 2015 ¹ .

Here is a bibliography entry in AIP style:

¹ H.D. Young and R.A. Freedman, Sears & Zemansky's University Physics (Addison-Wesley, San Francisco, CA, 2015) p. 160

ACS is the number five citation style used in science

ACS style is the standard citation style for chemistry. This style uses both numeric and author-date citations systems. The numbered in-text citations can have either a superscript number or a number in italics. Full references for each source are listed at the end of the paper.

ACS style resources

🌐 Official ACS style guidelines

🗂 ACS style guide

📝 ACS citation generator

ACS style examples

Here is an in-text citation in ACS author-date style:

The opposing side was given first (Brown et al., 2017) .

Here is a bibliography entry in ACS author-date style:

Brown, T.E.; LeMay H.E.; Bursten, B.E.; Murphy, C.; Woodward, P.; Stoltzfus M.E. Chemistry: The Central Science in SI Units . Pearson: New York, 2017.

IEEE is the number six citation style used in science

IEEE style is used for engineering and science papers. This style uses a numeric, in-text citation format, with a number in square brackets. This number corresponds to a reference list entry at the end of the paper.

IEEE style resources

🌐 Official IEEE style guidelines

🗂 IEEE style guide

📝 IEEE citation generator

IEEE style examples

Here is an example of an in-text citation in IEEE style:

As seen in a multi-camera study [1] ...

Here is a bibliography entry in IEEE style:

[1] E. Nuger and B. Benhabib, “Multi-Camera Active-Vision for Markerless Shape Recovery of Unknown Deforming Objects,” J. Intell. Rob. Syst. , vol. 92, no. 2, pp. 223–264, Oct. 2018.

Frequently Asked Questions about citation styles used in science

The most frequently used citation style in the sciences is APA (American Psychological Association) style.

There are two major types of citation systems you can use: author-date or numeric. Numeric citation styles tend to be preferred for science disciplines.

Yes, you have to add a bibliography or reference list citing all sources mentioned in your scientific paper.

Some of the most popular scientific journals are: Science Magazine , Nature , and The Lancet .

Title pages for science papers must follow the format of the citation style that you’re using. For example, in APA style you need to include a title, running head, a name, and other details. Visit our guide on title pages to learn more.

What citation style to use for computer science

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The Principles of Biomedical Scientific Writing: Citation

Zahra bahadoran.

1 Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Parvin Mirmiran

2 Department of Clinical Nutrition and Human Dietetics, Faculty of Nutrition Sciences and Food Technology, National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Khosrow Kashfi

3 Department of Molecular, Cellular and Biomedical Sciences, Sophie Davis School of Biomedical Education, City University of New York School of Medicine, New York, United States

Asghar Ghasemi

4 Endocrine Physiology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Citation, the act of properly referring to others’ ideas, thoughts, or concepts, is a common and critical practice in scientific writing. Citations are used to give credit to own work, to support an argument, to acknowledge others’ work, to distinguish other authors’ ideas from one’s work, and to direct readers to sources of information. A good citation adds to the scientific prestige of the paper and makes it more valuable to the reader. The citation has three basic elements: quoting from others, an in-text reference to the source, and bibliographic details of the source. Beyond technical skills, the citation needs an in-depth knowledge of the field and should follow basic rules, including the selection of relevant and valid sources, stating information/facts from others’ work, and referring to others’ work accurately and ethically. Several systems and styles are used to cite scientific sources; however, the most commonly used systems in medical sciences are ‘author-date’ systems (e.g., Harvard system) and numerical systems (e.g., Vancouver system). Here, we discuss how to make an accurate, complete, and ethical citation, and provide simple and practical guides to organize references in a scientific medical paper.

According to Merriam Webster dictionary, the word citation is defined as “an act of quoting,” where quote means “to speak or write from another usually with credit acknowledgment.” In scientific communication, the citation is commonly considered a technical practice to refer to the source in the text to represent that the information is derived from an external source ( 1 , 2 ). The citation is more than just referencing; it provides more value than acknowledging the source of literature being reviewed and making a reference list ( 2 ). Citation helps the authors put their work in connection with previous ones, to tell the story artfully, to acknowledge others’ work, and to contextualize study findings ( 2 - 4 ). A well-referenced paper supports the novelty and value of the work and improves its visibility ( 5 ).

Regardless of its importance, the citation may be the least noticed aspect of a scientific manuscript ( 6 ). Citation errors, including misquotation and errors in the bibliography, are common in the medical literature. The prevalence of misquotations in different journals ranges from 10% to 20% ( 7 ), and about 50% to 70% of references of published papers contain at least one error ( 8 , 9 ). Inaccurate quotations are displeasing for the cited author, misleading for the reader, and initiate circulation of false facts ( 7 , 10 ). The consequences of bibliography errors include difficulty in reference retrieval, limitation for the reader to read more widely, failure to credit the cited author(s), and inaccuracies in citation indexes.

Following our previous guides on how to write Introduction ( 11 ), Material and Methods ( 12 ), Results ( 13 ), Discussion ( 14 ), Title ( 15 ), and Abstract and keyword ( 16 ) of a hypothesis-testing paper, here, we provide a practical guide on importance and function of the citation of a scientific medical paper. We discuss how to select sources for the citation, quote information from others’ work, refer to the sources, and make an accurate reference list for a scientific biomedical paper.

2. Functions of Citation

The citation is used to give credit to an author’s work, acknowledge other’s work, distinguish an author’s ideas from others, direct readers to original sources of information, and avoid plagiarism ( 2 - 4 , 17 ). Citation help readers to understand the work, to justify the conclusions, to judge the novelty and scope of the manuscripts ( 18 ), and critically evaluate what contribution the study makes ( 4 , 19 ). Using proper citation is the only way to use the work of others and not commit plagiarism ( 20 ). To avoid plagiarism, authors need to accurately refer to the most relevant publications and cite facts and conclusions ( 1 , 20 ). Functions of the citation in different sections of an original paper are shown in Box 1; note that the result section does not have any citation.

3. Components of the Citation

The citation has three components: (1) quotation, i.e., providing either a summary, a paraphrase or a direct quotation from others’ works, (2) in-text references, i.e., brief addressing to the source, and (3) bibliographic details, i.e., name of the authors, source of publication, date of publication.

3.1. Quotation

Quotations from other sources can be provided by direct quoting, paraphrasing, or providing a summary ( 3 ). In direct quoting, others statements (more than six consecutive words) are exactly copied, put in the quotation marks, and immediately followed by an in-text citation to the original source; every word and punctuation mark should be exactly the same as the original version ( 17 , 20 , 22 ). Direct quoting is used when original words express an idea distinctively or more concisely than your summary, as well as to present well-known statements or to provide historical context for a particular theory or construct ( 8 , 23 ). Direct quoting is not used for reporting findings of a published work, variable names, and operational definitions. Box 2 provides some practical tips for the appropriate use of direct quotations.

In paraphrasing, authors express others’ writing in their own words ( 23 ), followed by a reference to the original source. In cases of paraphrasing another’s work or idea, authors should check their statement to be accurate and fair ( 17 , 20 ). Use of synonyms and rephrasing are typical ways to change the original statements ( 9 ); however, if the paraphrase is too close to the source text in wording, syntax, and structure, it may be considered ‘patch-writing’, which is “the act of making small changes and substitutions to the copied source material” ( 24 ). Note that paraphrasing and summarizing are complex and critical academic skills and depend on one’s knowledge of the content ( 25 ).

In providing a summary, a brief statement of the main points of a work (paper, book or chapter) is presented ( 23 ) using a neutral, affiliating, or distancing approach; in affiliating and distancing approaches, not only existing knowledge is summarized but also authors present their stance/viewpoint ( 2 ). The authors need to present their approaches accurately and persuasively by using appropriate verbs ( 2 ). For a neutral summary, use of verbs ‘comment’, ‘explain’, ‘indicate’, ‘note’, ‘describe’, ‘observe’, remark’, ‘state’, and ‘find’ is recommended ( 2 ). These referring verbs can be used either in the present or the past tense; using the present tense indicates that the source is recent and still valid, whereas the past indicates that the source is older and may be out of date ( 3 ). To find further appropriate verbs and vocabularies to cite the literature being reviewed, readers can refer to other works ( 2 , 26 ).

3.2. In-Text References

In-text references (brief address to the source in text) are presented by three major systems: ‘citation-sequence’, ‘citation-name’, and ‘name-year’. In the ‘citation-sequence’ system, numbers are used to refer to the reference list ( 27 , 28 ), which is numbered sequentially according to the appearance in the text. In the ‘citation-name’ system, the numbering system is used to refer to the reference list, which is numbered in alphabetical order by authors’ names; it means numbers are used in the text regardless of the order in which they appear ( 28 ). The ‘name-year’ system consists of the surname of the author and the year of publication, and the reference list is alphabetically ordered first by author and then by year ( 28 ). If ‘name-year’ system is used, in case of referring to two references with the same first author, chronological hierarchy order is followed (e.g., Annesley, 2010; Annesley, 2011), and in case of the same first author and same publication year, the references need to be differentiated by alphabetical letters after the year of publication (e.g., Annesley, 2010a; Annesley, 2010b) ( 19 ). If the name of author/editor cannot be identified, use the title of the work and the year of publication instead; if the date is not identified, use the phrase ‘no date’ after author’s name and where both author and date are unknown, use the title followed by ‘no date’ ( 23 ).

Citation management software programs (e.g., EndNote, Reference Manager, RefWorks, ProCite, and Refbase) easily connect in-text references to the reference list. These programs can format in-text references and bibliographic details in a different style (discussed in section 4) and can change them from one style to another.

The general rule to refer to a reference in the text is to place the reference immediately after the idea or fact introduced. In other words, an in-text referring might appear in the middle of a sentence and not always at the end ( 6 , 19 ). Unless a sentence ends with a fact (in which case the citation follows), the authors should not pool all the references at the end of a sentence ( 29 ). In case of citing multiple facts in a sentence, it should be clarified which reference is corresponding to which fact ( 19 ). Wherever more than one reference is used to support a fact, the authors should refer to the references in chronological order (the oldest reference is listed as the first in-text reference) ( 19 ). For direct quoting or citing a specific idea or piece of information, the page number of the quote should be included in the in-text reference ( 23 , 30 ). For an in-text citation that refers to secondary sources (second-hand references), name the original source and then use the term ‘cited by’ followed by the reference for the work in which it is quoted (e.g., Schweer, cited by Harrison, 1992, p. 774) ( 31 ).

3.3. Bibliographic Details (Reference List)

Every in-text reference should have a corresponding entry in the reference list ( 28 ); the exceptions are ‘personal communications’ ( 28 ), and ‘unpublished data’ ( 6 ) that are referenced within the text, but do not appear in the reference list. According to the British Standards Institution, a reference is “a set of data describing a document, sufficiently precise and detailed to identify it and enable it to be located” ( 32 ). The essential elements and order of the most common forms of references, including journal articles, books, reports, and websites, are given in supplementary Box 1.

The bibliographic details provided in the reference list should be accurate and complete to ensure that readers will be able to locate the material as easily as possible ( 32 ). The accuracy of the reference list increases the credibility of the author, the journal, and the research itself ( 33 ). To increase the accuracy of the bibliographic details, ICMJE (International Committee of Medical Journal Editors) recommends that “References should be verified using either an electronic bibliographic source, such as PubMed, or print copies from original sources” ( 34 ). Errors in the reference list usually arise by copying bibliographic details from previous papers; thus, authors should not copy from reference lists or databases, and the only reliable source is the original paper published in the journal ( 8 ). In case of using second-hand information, bibliographic detail of a source, where the information is found, should be included in the reference list.

4. Referencing Systems and Styles

Broadly, three types of referencing systems are employed in the academic world ( 3 ). These are, (i) consecutive-numbering system (well-known as Vancouver), (ii) author name-publication year system (well-known as Harvard) ( 19 ); (iii) footnote/endnote system, where sources are listed at the bottom of the page or at the end of the paper and the numbers in superscript run consecutively throughout the paper ( 3 ). The first two systems are commonly used in medicine, whereas the third system is most often used in the humanities. Other less common reference styles that have been established and used within different fields of science and disciplines include Modern Language Association (MLA) ( 35 ), the American Psychological Association (APA) ( 36 ), the Chicago Manual of Style (CMS), and the American Medical Association (AMA) Style ( 29 ).

The first format for bibliographic references in medical science was adopted officially by the Vancouver Group and the National Library of Medicine (NLM), in 1979 ( 37 ). The Vancouver Group was a small group of editors of medical journals who met informally in 1978 in Vancouver, British Columbia, to establish guidelines for the format of manuscripts submitted to their journals ( 37 ); the group expanded into the ICMJE and developed ‘the Uniform Requirements for Manuscripts Submitted to Biomedical Journals,’ which is updated regularly ( 38 ) ( http://www.icmje.org ). The reference style is famed as the Vancouver style because of its origin, and it has become a broadly accepted bibliographic format ( 8 ). According to the Vancouver style (the author-number system), references are numbered consecutively in the order in which they are first mentioned in the text; references in text, tables, and legends should be identified by Arabic numerals in parentheses ( 38 ). The Vancouver style is used by PubMed and MEDLINE.

The Harvard system, so-called as the ‘parenthetical author-date method’, is another popular referencing system ( 31 ). The origin of the system is obscure; however, the first evidence of the system goes back to 1881, when Edward Laurens Mark, professor of anatomy and director of Harvard’s zoological laboratory, published a landmark cytological paper and used parenthetic author-year citation ( 39 ). As Chernin narrated ( 39 ), from an editorial note in the British Medical Journal in 1945, the expression ‘Harvard system’ was not introduced by the Harvard University, but an English visitor to the library of Harvard University was impressed by the system of bibliographical reference and named it as the ‘Harvard system’ upon their return to England. The Royal Society defined the Harvard referencing system in 1965 as “a system in which names and dates are given in the body of the text and the references alphabetically at the end of the paper” ( 31 ).

Although most biomedical journals have adopted the Vancouver style, some still prefer the Harvard system, because they like to know just what author(s) is/are being cited as they read the text ( 40 ). However, the Harvard system is criticized due to potential difficulties that it may create for the readers. For example, if they are interested in an item in the reference list, they need to look it up within the main text. This system may also disrupt the text when a large number of references need to be cited within a paragraph ( 40 ).

Although medical journals specify Vancouver or Harvard systems, some journals have made minor modifications ( 41 ). For example, they have modified the referencing systems, both in-text references, and bibliographies, they have changed punctuation marks, used bold, and italics enhancements, alphabetical or sequential ordering of references, or have made combinations of variations that create a unique reference style that is as large in number as the number of journals currently published ( 41 , 42 ). Authors should carefully follow the format used by the target journal that is usually given in the Information/Instructions for Authors.

5. Other Considerations

5.1. dealing with scientific sources.

The most important challenge of the citation process in a scientific work is ‘which sources must be selected for citation’ and ‘How do the authors deal with the literature being reviewed to cite others accurately and ethically?’ Existence of a large number of publications on the topic makes selection difficult; however, authors should artfully select them to cover all citation purposes and add to the manuscript scientific prestige ( 43 ). Among available sources, the most relevant, valid, methodologically sound, and those with a landmark contribution to the topic should be selected ( 9 , 17 ). If there are a significant number of prior studies on the topic, the most comprehensive and the most recent works should be selected because they presumably discuss and reference the older studies ( 44 ).

The most valid and available sources for citing are published peer-reviewed original journal articles; primary sources (research articles written by those who conducted the research) are preferred ( 21 ). Secondary sources (review papers) can be used when primary sources are unavailable, or a summary for elaborating research problem is more effective; however, they should not be taken as definitive word or fact on the topic ( 9 ). Citation of review articles rather than the original papers should be limited ( 45 , 46 ) since it fails to provide credit or acknowledge the effort of the authors of original research papers. In addition, it may lead to misinterpretation or oversimplification of original research findings ( 45 ). The use of high-quality systematic review is acceptable; otherwise, it should be acknowledged in the text as a review paper to prevent misleading the casual reader about the originality of the work ( 9 ).

Less valid sources (i.e., theses, conference proceeding papers, unpublished data, abstracts, and personal communications) are not recommended ( 19 ) unless they contain essential information not available from public sources ( 47 ). These less valid references can only be used for supporting the results of preliminary studies or citing parallel results in another study population ( 17 ). In case of referring to ‘unpublished sources’ or ‘personal communications,’ the written permission of the author is required to ensure the accuracy of the data and prior approval from the authors ( 6 , 17 ).

Sources that may not be found in public domain, e.g., submitted but unaccepted journal articles, meeting abstracts, and posters should not be used ( 6 , 17 ). Standard textbooks are not cited except for describing a theoretical or methodologic principle or a statistical procedure. As stated by ICMJE, authors are responsible for checking that the references cited not be retracted articles ( 34 ).

5.2. Statement Needs to be Supported by a Reference

As a general rule, findings/statements of other’s work need to be supported by references ( 9 ). Statements like ‘the literature suggest that…’ or ‘there is general agreement that…’ should be followed by addressing one or more references ( 9 ); it is, however, not appropriate and usually essential to support a statement with more than 3 or 4 references ( 9 ). In contrast, common knowledge in a field, defined as facts, dates, events, or information that are expected to be known by someone studying or working in a particular field (e.g., long-established facts or theories), or facts that can be found publicly (e.g., date of the second world war) and are likely to be known by many people (e.g., capital cities of the countries) do not generally have to be referenced ( 23 ).

5.3. Accuracy and Ethics of the Citation

Accurate citation is a crucial issue, enabling readers to follow the flow of ideas and statements in a scientific field and ensure the integrity of the science being communicated ( 19 , 48 ). Citing the sources without retrieving and reading their full-texts and understanding their entirety ( 19 ), giving multiple similar references to support a single statement, or using a single source to support multiple statements are among examples of inaccurate citations ( 48 ). Since an abstract is a brief summary of the work, its content may not accurately present details reported in the text, and therefore, it is a poor practice to cite references after skimming results of the abstract rather considering the whole text ( 9 ).

To avoid inaccurate quoting, the authors should review the entire original article to check the facts. They should be careful in case of paraphrasing or summarizing in order to make sure that the intent or meaning of the original author is not altered ( 49 ). To reduce the risk of misinterpretation of information, the use of secondary sources should be avoided ( 49 ). According to NLM, “The medical literature is full of references that have been cited from other references, serving only to perpetuate erroneous information”, thus, they emphasizes that the authors should never reference documents that they have not read ( 27 ).

Spurious citation, biased citation, and over self-citation are also common problems of citation (Box 3). Self-citation, defined as citing one’s own work in a scientific paper, is a common practice and is an essential part of scientific communication, which represents the continuous and cumulative nature of the research process ( 50 ). When a researcher works on a specific topic for years, 25% self-citation is not uncommon ( 46 ). However, either irrelevant self-citation or over self-citation are considered unethical practices, which affect the precision of the paper ( 50 , 51 ). The spurious citation occurs where sources are not needed but are included anyway, e.g., over-citation or redundant citation (i.e., where the extra sources do not add any value beyond the first source), or citing an obscure, historical reference to give an impression of erudition ( 4 ).

6. Common Errors and Problems of Citation

Citation errors reflect badly on the authors and the publishing journal and may reflect underlying flaws in other areas of the published research ( 33 ). Citation content errors (e.g., inaccurate quoting from others) and both major and minor errors in referencing (both in-text references and bibliographic details) can occur during the citation process ( 4 , 7 , 33 ). Inaccurate quotations or misquotations are perpetual citation errors that lead to circulate a false ‘accepted fact’, which are very hard to correct ( 10 ). A list of common citation errors is provided in Box 3.

Major errors in references, which are responsible for up to 21% of citation errors in the medical field ( 53 ), prevent the source being retrievable ( 4 ). With minor errors (i.e., punctuation and spelling mistakes in bibliography, i.e., name of authors, title, journal, volume, year, and page numbers), references can still be found ( 4 , 9 ). Potential pitfalls of citation-management software programs may also cause some citation errors ( 54 ). Several duplicate copies of a reference in the software may be inserted due to importing the same reference on a number of different occasions (maybe with different patterns); this may lead to the appearance of duplication in the reference list ( 6 , 48 ). In the case of anonymous papers (prepared by a committee or a group of authors), some mistakes may occur ( 54 ). Another common mistake relates to the journal-title; the journal-title may be imported in the abbreviated form, while both full title and conventional abbreviation need to be entered into the journal section of the reference manager ( 54 ). To sum up, the author is responsible for final checking the accuracy of the bibliographic details ( 19 ) and should correct reference manager databases before the reference is exported to the final bibliography.

7. Conclusion

Making good and accurate citations adds to the manuscript’s scientific prestige and signifies that authors have an in-depth knowledge of the literature and writing skills. An original research paper usually has 25 - 40 references and the authors should be note that citing too few or too many references may reflect poor intellectual attitude and work validity. The most important, most elegant and the most recent sources should be selected for citation.

Authors' Contribution: Study concept and design: Zahra Bahadoran and Asghar Ghasemi; drafting of the manuscript: Zahra Bahadoran, Parvin Mirmiran, and Asghar Ghasemi; critical revision of the manuscript for important intellectual content: Khosrow Kashfi and Parvin Mirmiran.

Conflict of Interests: The authors have no conflict of interest.

Funding/Support: This study was supported by the Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences.

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5 Accessing Scientific Literature and Referencing

An essential skill for all scientists to master is the ability to access relevant and reliable scientific information from a variety of sources.

You will need access to scientific literature for a variety of reasons:

  • designing an experiment
  • writing an article or essay
  • designing a poster.

All of these tasks involved sourcing reliable, authoritative literature, and you’ll need to know how to reference it.

This chapter will provide student scientists with assistance in navigating the many avenues for locating scientific literature and referencing it, including using the reference management software EndNote.

5.1 Types of scientific literature

Screenshot of a report titled effects of systemic hypoxia in human muscular adaptions to resistance exercise training

The two main types of scientific literature are original investigations and literature reviews.

Original investigations ( Figure 5.1 ) are published accounts of new studies undertaken on a particular topic. They will generally step the reader through the stages of the study:

  • introduction

Screenshot of article titled cerebral oxygenation and hyperthermia

Published literature reviews ( Figure 5.2 ) present a synthesis and evaluation of the existing literature on a particular topic with the aim of gaining a new, deeper understanding of the topic. The review article will be structured around themes rather than stages of the scientific method.

5.2 Accessing scientific literature

You can locate scientific literature via Google Scholar , online databases such as PubMed, and the University of Southern Queensland library website when you are looking for a specific article or searching for literature on a specific topic.

Google Scholar

Google Scholar provides a simple way to perform a broad search for scholarly literature. From one place, you can search across many disciplines and sources:

  • court opinions.

Academic publishers, professional societies, online repositories, universities and other web sites all publish these types of literature. Google Scholar helps you find relevant work across the world of scholarly research.

Box 5.1: Search tips

  • Set your preferences to retrieve your university library resources: For example, select Settings > Library Link > add University of Southern Queensland Library > Save
  • Use the asterisk * (e.g. child* will find child, children, childhood, childless)
  • Use the asterisk as a placeholder to find a word within words e.g. “acquired * injury” finds acquired brain injury
  • Use quotes to search by phrase (e.g. “type 2 diabetes” or “social media”)

Try this search in Google Scholar: “patient information” AND “back pain”

Extra help with using Google scholar is at this webpage. 

Databases, what are they and how do I use them to find information?

Databases are another way to find quality academic and scholarly information. The USQ library subscribes to many databases that are relevant to your studies in human physiology, such as:

  • Web of Science
  • ClinicalKey
  • ScienceDirect
PubMed is a database that comprises of more than 26 million citations for biomedical literature from MEDLINE, life science journals and online books. Citations may include links to full-text content from PubMed Central and publisher websites.

Journals contain scholarly articles written by experts in specific disciplines. This tutorial explains what scholarly journals are and how to access them from the USQ library.

5.3 Determining if an article is scholarly or peer reviewed

It can be hard to work out if a journal is scholarly or peer reviewed. There is a lot of information online that looks like proper science, but isn’t! These tips can help you determine if you are accessing reliable information.

If searching in a library database:

  • Check to see if there is a box on the database search page that allows you to limit your search results to refereed or peer-reviewed journal articles.

If you already have a journal article or title, use these option to check if it is scholarly or peer reviewed: 

  • Look at the article itself for a header or similar that indicates refereed or reviewed.
  • Look at the table of contents of the journal. Often items are grouped under a heading like ‘reviewed articles’.
  • Check the journal’s website to see if a statement is made about the content being peer reviewed or refereed. However, be aware that not all the contents of a refereed journal will be refereed (e.g. books reviews, practice, commentaries, editorials are not peer reviewed).
  • Look for the Ulrichsweb database in your library catalogue. If you have access, use the ‘Quick Search’ drop down and select ‘Title (keyword)’ and type in the journal title. Next to journal titles that include at least some refereed content is the image of a black and white striped  ‘referee’s shirt’.  You can also click on the journal title and you will see ‘Refereed – yes or no’.

5.4 Library website resources to assist with searching for authoritative information

Your university library will provide tutorials and resources to help you search for authoritative information.

5.5 Referencing

Anyone who reads your work will need to know where you got your information from if you didn’t generate it yourself (e.g. the results of your experiment). The reference section provides a list of the references that you cited in the body of your work, whether it be a literature review, original investigation research article or essay.

It is important to accurately cite references in research papers to acknowledge your sources and ensure credit is appropriately given to authors of work you have referred to. An accurate and comprehensive reference list also shows your readers that you are well-read in your topic area and are aware of the key papers that provide the context to your research.

It is important to keep track of your resources and to reference them consistently in the format required by the publication in which your work will appear. Most scientists will use referencing software to store details of all of the journal articles (and other sources) they use while writing their review article. This software also automates the process of adding in-text references and creating a reference list.

In-text citations indicate where (within your sentences) you have used the ideas of other scientists. The in-text citations will either be provided as a number, or as the name of the author and date of publication. A reference list is a list of all the sources that you have used as in-text references in your scientific paper that enables the reader of your work to locate and verify the sources you have use.

Here are two basic formats for a reference list:

  • an alphabetical listing by first author’s last name (author–date system)
  • a numerical listing that reflects the order of the citations in the body of the paper (number format).

The format will depend on the journal of publication, as each journal has their own specific referencing format.

A bibliography tends to use the author–date format, as the works might not be cited in the text.

Author–date system

Author-date reference styles indicate in-text citations by placing the author’s surname and the date of publication in brackets, and the reference list is in alphabetical order by author’s surname. Harvard and APA are examples of author date styles.

The associated images show a section of the discussion, and a section of the reference list of a research article (Bain et al., 2014) that has used an author-date system.

Example of author date referencing, with annotations showing in-text citations and two examples of the formatting of references in a reference list

Your university library will provide guidance and examples of the referencing styles you are expected to use. Ask your tutor which style you are to use for your assignment.

This short video shows you the basics of Harvard referencing. Please note there are different interpretations of the style and use the resources provided by your university library when composing your own in-text citations and reference lists.

Click the drop down below to review the terms learned from this chapter.

Bain, A.R., Morrison, S.A., & Ainslie, P.N. (2014). Cerebral oxygenation and hyperthermia. Frontiers in Physiology, 5 , 92.

How To Do Science Copyright © 2022 by University of Southern Queensland is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

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Formatting guide

This guide describes how to prepare contributions for submission. We recommend you read this in full if you have not previously submitted a contribution to Nature . We also recommend that, before submission, you familiarize yourself with Nature ’s style and content by reading the journal, either in print or online, particularly if you have not submitted to the journal recently.

Formats for Nature contributions

Articles are the main format for original research contributions to Nature . In addition, Nature publishes other submitted material as detailed below.

Articles are original reports whose conclusions represent a substantial advance in understanding of an important problem and have immediate, far-reaching implications. In print, physical sciences papers do not normally exceed 6 pages on average, and biological, clinical and social-sciences papers do not normally exceed 8 pages on average. However, the final print length is at the editor’s discretion.

Articles start with a fully referenced summary paragraph, ideally of no more than 200 words, which is separate from the main text and avoids numbers, abbreviations, acronyms or measurements unless essential. It is aimed at readers outside the discipline. This summary paragraph should be structured as follows: 2-3 sentences of basic-level introduction to the field; a brief account of the background and rationale of the work; a statement of the main conclusions (introduced by the phrase 'Here we show' or its equivalent); and finally, 2-3 sentences putting the main findings into general context so it is clear how the results described in the paper have moved the field forwards. Please refer to our annotated example   to see how the summary paragraph should be constructed.

The typical length of a 6-page article with 4 modest display items (figures and tables) is 2500 words (summary paragraph plus body text). The typical length of an 8-page article with 5-6 modest display items is 4300 words. A ‘modest’ display item is one that, with its legend, occupies about a quarter of a page (equivalent to ~270 words). If a composite figure (with several panels) needs to occupy at least half a page in order for all the elements to be visible, the text length may need to be reduced accordingly to accommodate such figures. Keep in mind that essential but technical details can be moved into the Methods or Supplementary Information.

As a guideline, articles typically have no more than 50 references. (There is no such constraint on any additional references associated with Methods or Supplementary Information.)

Sections are separated with subheadings to aid navigation. Subheadings may be up to 40 characters (including spaces).

Word counts refer to the text of the paper. Title, author list, acknowledgements and references are not included in total word counts.

Matters Arising and Corrections

Matters Arising are exceptionally interesting or important comments and clarifications on original research papers or other peer-reviewed material published within the past 18 months in Nature . They are published online but not in print.

For further details of and instructions for how to submit such comments on peer-reviewed material published in Nature — or to notify editors of the potential need for a correction — please consult our Matters Arising page.

Other contributions to Nature

Please access the other submitted material pages for further details on any of the contribution types below:

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Books & Arts

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Insights, Reviews and Perspectives

Technology Features

The editorial process

See this section for an explanation of Nature 's editorial criteria for publication, refereeing policy and how editors handle papers after submission. Submission to a Nature journal is taken by the journal to mean that all the listed authors have agreed to all of the contents. See authorship policy for more details.

Presubmission enquiries

If you wish to enquire whether your Article might be suitable for consideration by Nature , please use our online presubmission enquiry service . All presubmission enquiries must include a cover paragraph to the editor stating the interest to a broad scientific readership, a fully referenced summary paragraph, and a reference list.

Readability

Nature is an international journal covering all the sciences. Contributions should therefore be written clearly and simply so that they are accessible to readers in other disciplines and to readers for whom English is not their first language. Thus, technical jargon should be avoided as far as possible and clearly explained where its use is unavoidable. Abbreviations, particularly those that are not standard, should also be kept to a minimum. The background, rationale and main conclusions of the study should be clearly explained. Titles and abstracts in particular should be written in language that will be readily intelligible to any scientist. Essential but specialized terms should be explained concisely but not didactically.

For gene, protein and other specialized names authors can use their preferred terminology so long as it is in current use by the community, but they must give all known names for the entity at first use in the paper. Nature prefers authors to use internationally agreed nomenclature. Papers containing new or revised formal taxonomic nomenclature for animals, whether living or extinct, are accepted conditional on the provision of LSIDs (Life Science Identifiers) by means of registration of such nomenclature with ZooBank, the proposed online registration system for the International Code of Zoological Nomenclature (ICZN).

Even though no paper will be rejected because of poor language, non–native English speakers occasionally receive feedback from editors and reviewers regarding language and grammar usage in their manuscripts. You may wish to consider asking colleagues to read your manuscript and/or to use a professional editing service such as those provided by our affiliates Nature Research Editing Service or American Journal Experts . You can also get a fast, free grammar check of your manuscript that takes into account all aspects of readability in English. Please note that the use of a language editing service is not a requirement for publication in Nature .

Nature 's editors provide detailed advice about the expected print length when asking for the final version of the manuscript. Nature 's editors often suggest revised titles and rewrite the summary paragraphs of Articles so the conclusions are clear to a broad readership.

After acceptance, Nature 's subeditors (copyeditors) ensure that the text and figures are readable and clear to those outside the field, and edit papers into Nature 's house style. They pay particular attention to summary paragraphs, overall clarity, figures, figure legends and titles.

Proofs are sent before publication; authors are welcome to discuss proposed changes with Nature 's subeditors, but Nature reserves the right to make the final decision about matters of style and the size of figures.

A useful set of articles providing general advice about writing and submitting scientific papers can be found on the SciDev.Net website.

Format of Articles

Contributions should be double-spaced and written in English (spellings as in the Oxford English Dictionary ).

Contributions should be organized in the sequence: title, authors, affiliations (plus present addresses), bold first paragraph, main text, main references, tables, figure legends, methods (including separate data and code availability statements), methods references, acknowledgements, author contributions, competing interest declaration, additional information (containing supplementary information line (if any) and corresponding author line), extended data figure/table legends. In order to facilitate the review process, for initial submissions we encourage authors to present the manuscript text and figures together in a single file (Microsoft Word or PDF, up to 30 MB in size). The figures may be inserted within the text at the appropriate positions or grouped at the end, and each figure legend should be presented together with its figure. Also, please include line numbers within the text.

Titles do not exceed two lines in print. This equates to 75 characters (including spaces). Titles do not normally include numbers, acronyms, abbreviations or punctuation. They should include sufficient detail for indexing purposes but be general enough for readers outside the field to appreciate what the paper is about.

An uninterrupted page of text contains about 1250 words.

A typical 6-page Article contains about 2,500 words of text and, additionally, 4 modest display items (figures and/or tables) with brief legends, reference list and online-only methods section if applicable. A composite figure (with several panels) usually needs to take about half a page, equivalent to about 600 words, in order for all the elements to be visible (see section 5.9 for instructions on sizing figures).

A typical 8-page Article contains about 4300 words of text and, additionally, 5-6 modest display items (figures and/or tables) with brief legends, reference list and online-only methods section if applicable. A composite figure (with several panels) usually needs to take about half a page, equivalent to about 600 words, in order for all the elements to be visible (see section 5.9 for instructions on sizing figures).

Authors of contributions that significantly exceed the limits stated here (or as specified by the editor) will have to shorten their papers before acceptance, inevitably delaying publication.

Nature requires authors to specify the contribution made by their co-authors in the end notes of the paper (see section 5.5). If authors regard it as essential to indicate that two or more co-authors are equal in status, they may be identified by an asterisk symbol with the caption ‘These authors contributed equally to this work’ immediately under the address list. If more than three co-authors are equal in status, this should be indicated in the author contributions statement. Present addresses appear immediately below the author list (below the footnote rule at the bottom of the first page) and may be identified by a dagger symbol; all other essential author-related explanation is placed in the acknowledgements.

Our preferred format for text is Microsoft Word, with the style tags removed.

TeX/LaTeX: If you have prepared your paper using TeX/LaTeX, we will need to convert this to Word after acceptance, before your paper can be typeset. All textual material of the paper (including references, tables, figure captions, online methods, etc.) should be included as a single .tex file.

We prefer the use of a ‘standard’ font, preferably 12-point Times New Roman. For mathematical symbols, Greek letters and other special characters, use normal text or Symbol font. Word Equation Editor/MathType should be used only for formulae that cannot be produced using normal text or Symbol font.

The ‘Methods’ section is in the main text file, following the figure legends. This Methods section will appear in the PDF and in the full-text (HTML) version of the paper online, but will not appear in the printed issue. The Methods section should be written as concisely as possible but should contain all elements necessary to allow interpretation and replication of the results. As a guideline, the Methods section does not typically exceed 3,000 words. To increase reproducibility, authors are encouraged to deposit a detailed description of protocols used in their study in a protocol sharing platform of their choice. Nature Portfolio’s Protocol Exchange is a free and open service designed to help researchers share experimental know-how. Protocols deposited by the authors in Protocol Exchange will be linked to the online Methods section upon publication.

Detailed descriptions of methods already published should be avoided; a reference number can be provided to save space, with any new addition or variation stated.

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All authors should be included in reference lists unless there are more than five, in which case only the first author should be given, followed by ‘et al.’.

Please follow the style below in the published edition of Nature in preparing reference lists.

Authors should be listed surname first, followed by a comma and initials of given names.

Titles of all cited articles are required. Titles of articles cited in reference lists should be in upright, not italic text; the first word of the title is capitalized, the title written exactly as it appears in the work cited, ending with a full stop. Book titles are italic with all main words capitalized. Journal titles are italic and abbreviated according to common usage. Volume numbers are bold. The publisher and city of publication are required for books cited. (Refer to published papers in Nature for details.)

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Recognized preprints may be cited in the reference list. Example: Babichev, S. A., Ries, J. & Lvovsky, A. I. Quantum scissors: teleportation of single-mode optical states by means of a nonlocal single photon. Preprint at http://arXiv.org/quant-ph/0208066 (2002).

References to web-only journals should give authors, article title and journal name as above, followed by URL in full - or DOI if known - and the year of publication in parentheses.

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references scientific paper

Compiled by Timothy T. Allen , revised 2000. This paper greatly expands upon a handout originally prepared by an unknown author for distribution to students in introductory earth science courses at Dartmouth College. The work is presented here without copyright, although acknowledgement is (of course) appreciated. This document is also available in in Adobe Acrobat Format

Introduction

It is important to properly and appropriately cite references in scientific research papers in order to acknowledge your sources and give credit where credit is due. Science moves forward only by building upon the work of others. There are, however, other reasons for citing references in scientific research papers. Citations to appropriate sources show that you've done your homework and are aware of the background and context into which your work fits, and they help lend validity to your arguments. Reference citations also provide avenues for interested readers to follow up on aspects of your work -- they help weave the web of science. You may wish to include citations for sources that add relevant information to your own work, or that present alternate views. The reference citation style described here is a version of the "Author, Date" scientific style, adapted from Hansen (1991) and the Council of Biology Editors (1994). Harnack & Kleppinger (2000) have adapted "CBE style" to cite and document online sources . When to Cite References in Scientific Research Papers You should acknowledge a source any time (and every time) you use a fact or an idea that you obtained from that source. Thus, clearly, you need to cite sources for all direct quotations. But you also need to cite sources from which you paraphrase or summarize facts or ideas -- whether you've put the fact or idea into your own words or not, you got the fact or idea from somebody else and you need to give them proper acknowledgement (even if an idea might be considered "common knowledge," but you didn't know it until you found it in a particular source).

If you have more than one source by the same author published in the same year, distinguish them both in the in-text citation and in the reference list, by appending the letters a, b, c... to the year, in the order in which the different references appear in your paper. (For example: Allen 1996a, 1996b.)

If your source of information has no individual identifiable author, use the name of the organization to which the work can be attributed in place of the author's name:

For internet sources without any identifiable author or date, simply use the URL address as the in-text citation:

As New England is located at the convergence of several distinct storm tracks ( http://www.mountwashington.org/mtw_mtn.htm ), we expect to find clear differences in isotopic composition among seasons and potentially among different rain storm events (Fig. 1).

Such a source would be omitted from your References Cited or Bibliography section.

References Cited (in this document)

Council of Biology Editors, 1994, Scientific style and format: the CBE manual for authors, editors, and publishers, 6th edition, Cambridge University Press, New York. 825 p.

Harnack, A., and Kleppinger, E., 2000, Online! A reference guide to using internet sources , Bedford/St. Martin's, http://www.bedfordstmartins.com/online/index.html (August 1, 2000).

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Research leap

How to write a reference list in scientific papers

New authors should always be able to explain the fitness of their study with regards to existing theories and findings. They should be build upon their work and referencing approximately 20 other articles published in peer-reviewed journals, providing full bibliographic information for each source. This way, your arguments are ipso facto becoming more appealing and persuasive. How to write a reference list

references scientific paper

Required steps before submitting your article

You should take into account when submitting your article to peer-reviewed journals , that your paper will be carefully revised by thoroughly versed experts knowing the subject matter in detail. As their professional interest correlates with the review of your submission, your job actually consists of persuading an experienced professional of the originality of findings and implications of your paper, making it deserving of wider attention. If you want your article to be considered seriously, you should use only quality resources.

In order to find top-notch e-collections, check out our article on reliable academic sources and discover respectable e-libraries and databases, such as those provided by Emerald Insight, JSTOR, Ebsco, and Hein Online. In turn, using credible scholarly sources will not only help you get your paper published but will further make your article more reliable in the eyes of the readers and increase your chances to boost citations. Opinions may differ from one person to another, and they may or may not be founded on established facts. But this is a risk you should not be willing to take. How to write a reference list

references scientific paper

How to quickly find authors for references

Supporting your thesis with an army of well-established authorities is crucial. Since the destiny of your article’s success depends on the most part on your statements being picked up, cited, utilized, and modified by others. In order to further their research aims, here you need to be not just a scientist, but also a rhetorical strategist. Since you can not pull your assumptions ex nihilo , they most certainly can not be generalizations of everyday opinion, but a result of established premises drawn from extensive literature review to be tested qualitatively or quantitatively. As the author, you have the assignment to gather as many as possible allies and resources, just according to actant-network theory. Your inscriptions, your data, and even the tone of your text should have a well-defined purpose. Nothing should be left to chance. How to write a reference list

This can be distributed in a few easy-to-follow steps.

  • Find established scientists in your domain and get their attention
  • Try to make contact and establish further communication on the issue at hand
  • Put your work to test trials of strength. Since we all prefer heroes, imagine if the dissenter asking, “Yeah, but can your research prove that? “ is putting more and more challenges forward.

Rather than skipping or trying to avoid it altogether, you should use it to your advantage. It may point out some weaknesses in your argumentation that could otherwise come to hunt you later. It is much easier, and not to mention cheaper and beneficial to your reputation, to fix any omission or gap in discussion before your paper hits the mainstream publications.

Stages to find all the relevant references

First of all, you need to make sure to find all the relevant references that fully or partially support your claim. You also need to engage in a little role-play game of internal dialog, meaning, you must be both an author and a reader. We can’t highlight enough how crucial it is for you to anticipate the objections of your readers and dissenters, carefully revise their standpoint, and then provide a convincing counter-argument.  Try to find authors that already faced their objections and transform this dispute to your advantage. You need to find the best and most common online research tools  to help you learn to browse key literature fast and quickly collect find up-to-date statistics for your paper. How to write a reference list

references scientific paper

Steps to boose the reference list

For example, when you need to boost your reference list relatively quickly, some tricks may come in hand .  Although you probably already know your core literature by heart, science and practice are progressing with each new academic article and scholarly paper opening up new horizons and proposing new conceptual frameworks and models. Find common themes or variables corresponding to your paper, and then browse the author’s literature review and list of reference.

In almost all cases, you can find recent studies in the relevant domain in there. Better yet, if you already have a target journal for submitting your paper at mind, take your time and carefully browse through their archive to find the most compelling articles eligible for linking to your work. Bear in mind science is exponentially progressive. That is why, do not make a mistake of listing outdated literature without some fresh insights. Most often than not, your paper will ultimately serve the same purpose. Usually, a person doing research and citing your paper looks through the reference list of your article. Because it is important for this person the materials you used to  evaluate your article.

Using reference management tools

Make a list of most frequent authors referred to in related articles, and then take advantage of Google Scholar, Sage publications, Research leap or Research gate to gain access to the original papers.  See how their main findings correspond to your main assumptions, and when possible, highlight the connection to your convenience. How to write a reference list

How to write a reference list

There are several tools available to help you extend your reference list. This allows you import the information from the papers such as names of authors, publications years and volume numbers. In short, all you need for creating a reference list of the sources you used. To find the extended list of available online reference sites, you may find our post on choosing the appropriate referencing style quite useful.

Mendeley is a free reference manager. It is also an academic, a social network that can help you organize your research. This reference manager helps you collaborate with others online, and discover the latest research. It helps you to:

  • Automatically generate bibliographies
  • Collaborate easily with other researchers online
  • Easily import papers from other research software
  • Find relevant articles based on what you’re reading

Zotero is the only research tool that automatically senses content. It is a good tool to allowe you to add it to your personal library with a single click. Whether you’re searching for a preprint on arXiv.org, a journal article from JSTOR, a news story from the New York Times, or a book from your university library catalog, Zotero has you covered with support for thousands of sites. Like Mendeley, Zotero has an extension for internet browsers which automatically imports PDFs and bibliographic information into the stand-alone program. Furthermore, it also has a Microsoft Word citation tool which allows users to add references to their documents seamlessly.

EndNote gives you the tools you need for searching, organizing, and sharing your research. It allows you to easily create bibliographies while writing your next paper with features like Cite While You Write. Maximize your time with features like finding full text for your references and automatically updating records. EndNote’s syncing capabilities let you access all of your references, attachments, and groups from anywhere.

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Characteristics of References

  • Provides the reader with information about who conducted the research, when it was published and the journal that published the work.
  • Provides detailed information about author names, article title, journal name, volume, issue and page numbers so that readers can easily find the source of the information.
  • Acknowledges the scientist(s) who conducted the research and/or the journal article where the research was originally published.  

The References (or Bibliography) section should list all the sources of information that were used in the poster.   This section appears at the end of the poster.   The References section ( Figs. 2 and 8 ) typically contains all journal articles (i.e., primary sources) but it can also contain secondary sources (e.g., newspapers, documentaries, government reports).   References tell the reader where the original data, information, technique, and/or method can be obtained, who conducted the work and when the paper was published.    

In posters, in-text citations are used to tell the reader where information was obtained.   An in-text citation should appear after every sentence in the poster that describes the work of others.   This includes all sentences that describe discoveries, findings, data, information, experiments, results, techniques, methods, dates, locations, etc.  

In-text citations can be done using either (1) superscript numbers or (2) authors last name, followed by year published.  

  • Polar bear cubs were 25% larger when fed a high-protein diet compared to high-sugar diet. 1      
  • Polar bear cubs were 25% larger when fed a high-protein diet compared to high-sugar diet (Jones and Smith, 2018).  

The “1” and “Jones and Smith, 2018” both refer to the same journal article:   E.J. Jones and W. A. Smith (2018), Journal of Natural Science, Vol. 53, Issue 12, pages 36-45.   Both types of in-text citations are acceptable for use in posters.   Authors typically choose superscript numbers to save space.      

Formatting References

You have likely been taught about MLA (Modern Language Association of America) or APA (American Psychological Association) formatting and style guide in middle or high school.   Many of you are likely proficient in these styles.   For most posters you likely will not follow the MLA nor APA styles when citing your sources.   There is a practical explanation for why these two styles often are not used in a poster. It is because there are thousands of different professional scientific societies around the world and each society has its own preferred formatting style that they use in publications for their journals and conferences.   Therefore, citation styles will vary depending on where a poster is presented.   In fact, many scientists use software, that, with a click of a button, will transform all of their citations into the proper style and format for any journal or conference.

Nonetheless, we provide 15 examples below of how one could cite primary sources (examples 1-5 below) and secondary sources (examples 6-15 below) of information in a scientific poster.  

Figure 8. References List

list of references

Citing Primary Sources

Peer-reviewed journal articles are considered primary sources.   Patents and Published Technical Reports from Government Agencies and Universities are also considered primary sources of information.   Five examples of how to cite primary sources are numbered below 1-5.  

1. Journal Article in Print:   Most journals are printed on paper others are entirely available online.   Authors Names. (Year Published in parenthesis). Article Title.   Journal Name, Volume Number (Issue Number in parenthesis): Page Numbers.  

1A. Journal Article with one or two authors:

McMurran, M. and Christopher, G. (2009). Bayes factors increases criminal sentence recommendations. Legal & Criminological Psychology, 14(1):101-107.

1B. Journal Article with more than two authors:  

Post, E., et al. (2009). Genome studies of quorum sensing organisms. Science, 325(5946):1355-1358.

2. Online Journal Article:   These journals are electronic and not printed on paper.   Authors Names. (Year Published in parenthesis). Title of article. Journal name. Volume number and or page numbers.   Include complete URL link in full or DOI if known.    

Dionne, M.S. and Schneider, D.S. (2002). Adaptive mutability in targeted microRNA infections. Genome Biol. 3:10.3559. http://genomebiology.com/2002/3/4/reviews/1010  

3. Government Technical Report in Print: Author names or name of organization. (Year Published in parenthesis). Report title.   Report Number. Name of government agency that published report, Place of publication.  

Smith, G.I. and Chen Y.P. (2018). Growth stages and tolerable fire intervals for Georgia’s native vegetation data sets. Report no. 247. U.S. Department of Interior. New York, NY, USA.

4. Government Technical Report Published Online: Author names or name of organization. (Year Published in parenthesis). Report title.   Report Number. Name of government agency that published report. Place of publication.   Date retrieved followed by complete URL link in full or DOI if known.  

Spandone, H.K. et al. (2017). Energy futures for Midwestern wind farms. Report no. C2.4715.12. U.S. Department of Energy. Washington D.C., USA.   Retrieved on February 15, 2017 from https://www.energy.gov/science-innovation/energy-sources/renewable-energy/wind

5. Patent : Author names. Date in parenthesis. Title of patented item, technique, method or process. Patent number.

Odell, J.C. (1970, April). Process for batch culturing. U.S. patent 484,363,770.

Citing Secondary Sources

Secondary sources report on and interpret results that have been presented in primary sources.   Secondary sources include books, documentaries, magazines, newspapers, podcasts, webpages from government agencies and universities.   Ten examples of how to cite secondary sources are numbered below 6-15.      

6. Book Chapter : Authors names. (Date of publication in parenthesis). Chapter title, page numbers. Editors of book, Book Title, Place of publication.   Name of publisher.  

Forman, M.S., and Valsamakis, A. (2003). Specimen collection, transport, and processing: virology, p. 1227-1241. Murray, P.R., et al. (Eds.), Manual of clinical microbiology, 8th ed, Washington, D.C. Penguin Press.  

Anderegg, D. (2007). Nerds: Who they are and why we need more of them. New York, NY. Jeremy P. Tarcher, Penguin Press.  

8. Magazine Article in Print :

Road map to a great deal. (2009, October). Consumer Reports, 74(10), 44-47.

9. Magazine Article Published Online :

Taibbi, M. (2009, September 3). Sick and wrong. Rolling Stone, 1086, 58-65. Retrieved on February 22, 2020 from http://www.rollingstone.com  

10. Newspaper Article in Print:

Lucchetti, A. & Craig, S. (2009, September 11). Morgan Stanley taps new boss. The Wall Street Journal, pp. A1, A16.  

11. Newspaper Article Published Online :

Moran, S. (2009, September 7). If you don’t snooze, you lose: Most Americans aren’t getting enough sleep. And for both adults and students, there are health consequences. Star Tribune. Retrieved on August 6, 2019 from http://www.startribune.com /  

12. Podcast :

Nature (Producer). (2009, July 16). Moon gazing in the Southern hemisphere, Audio podcast. Retrieved on November 5,2009, from http://www.nature.com/nature/podcast/index-2009-07-16.html  

13. Documentary, Video or Movie :

Donner, R. & Lee, S. (Producers), & Hood, G. (Director). (2009). X-Men Origins: Wolverine [DVD]. USA: Twentieth Century-Fox Film Corporation.  

14. Personal Web Page : In most instances a web page is not used as a reference in a poster.  

Wilson, E.O. (1999, September). Biological Diversity: The Oldest Human Heritage, New York State Museum, Albany. Retrieved on July 12, 2020 from https://eowilsonfoundation.org/e-o-wilson/  

15. Web Page of Organization or Group of Authors : In most instances, a webpage is not used as a reference in a poster.  

National Museum of American History. (2006, July 7). National museum of American history displays recent hip-hop acquisitions. Retrieved from https://americanhistory.si.edu  

Scientific Posters: A Learner's Guide Copyright © 2020 by Ella Weaver; Kylienne A. Shaul; Henry Griffy; and Brian H. Lower is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License , except where otherwise noted.

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How to Cite the References of a Scientific Paper

1. rules to follow.

There are two rules to follow in the references section, just as in the acknow­ledgments section.

First, list only significant published references. References to unpublished data, abstracts, theses, and other secondary materials should not clutter up the references or literature-cited section. If such a reference seems essential, you may add it parenthetically or, in some journals, as a footnote in the text. A paper that has been accepted for publication can be listed in the literature cited, citing the name of the journal followed by “in press” or “forthcoming.”

Second, ensure that all parts of every reference are accurate. Doing so may entail checking every reference against the original publication before the manuscript is submitted and perhaps again at the proof stage. Take it from an erstwhile librarian: There are far more mistakes in the references section of a paper than anywhere else.

Don’t forget, as a final check, to ensure that all references cited in the text are indeed listed in the literature cited and that all references listed in the liter­ature cited are indeed cited somewhere in the text.

2. ELECTRONIC AIDS TO CITATION

Checking that every reference is accurate, and that all cited items appear in the reference list, has become much easier in the electronic era. Common word­processing programs include features for tasks such as creating, numbering, and formatting footnotes and endnotes. These features can aid in citing refer­ences and developing reference lists. Some journals, however, say not to use these features, which can interfere with their publishing process. Check the journal’s instructions to authors in this regard.

Perhaps more notably, citation-management software—such as EndNote, Reference Manager, and RefWorks—lets a researcher develop a database of references and use it to create reference lists in the formats of many journals. Rather than keying in the information on each reference, you may be able to import it from bibliographic databases. Once the information is accurately entered, it should remain correct whenever it appears in a reference. Do, how­ever, still check references. Electronic gremlins sometimes lurk. So does human error; if somehow you indicated the wrong reference, the wrong reference will appear.

If you are not using reference-management software, consider looking into doing so. Using such software can especially save you time ifyou will cite some of the same references in multiple publications or if journals in your field have a variety of reference styles. Ifyou study or work at a university or other research institution, you might easily be able to obtain such software through it. Also, some universities provide instruction in using such software, for example, through their libraries. Consider checking.

3. CITATIONS IN THE TEXT

Many authors use slipshod methods in citing literature. A common offender is the “handwaving reference,” in which the reader is glibly referred to “Smith’s elegant contribution” without any hint of what Smith reported or how Smith’s results relate to the present author’s results. If a reference is worth citing, the reader should be told why.

Even worse is the nasty habit some authors have of insulting the authors of previous studies. It is probably all right to say “Smith (2015) did not study. . . .” But it is not all right to say “Smith (2015) totally overlooked, . . .” “Smith (2015) ignored, . . .” or “Smith (2015) failed to. . . .”

Some authors get into the habit of putting all citations at the end of sentences. This is wrong. The reference should be placed at that point in the sentence to which it applies. Michaelson (1990) gave this example:

We have examined a digital method of spread-spectrum modulation for multiple-access satellite communication and for digital mobile radiote­lephony. 1,2

Note how much clearer the citations become when the sentence is recast as follows:

We have examined a digital method of spread-spectrum modulation for use with Smith’s development of multiple-access communication 1 and with Brown’s technique of digital mobile radiotelephony. 2

4. REFERENCE STYLES

Journals vary considerably in their style of handling references. O’Connor (1978) looked at 52 scientific journals and found 33 different styles for listing references. Some journals include article titles within references, and some do not. Some insist on inclusive pagination, whereas others print the numbers of first pages only.

If you use an electronic reference management system, and if that system includes the styles of all the journals in which you might like to publish, you might not need to concern yourself in detail with differences among refer­ence styles. In that case, perhaps just skim—or even skip—the sections of this chapter that discuss formats for citing and listing references. If, however, you might at least occasionally be preparing and citing references by traditional means, we advise you to read these sections.

Whether electronically or otherwise, the smart author retains full informa­tion about every item that might be cited. Then, in preparing a manuscript, he or she has all the needed information. It is easy to edit out information; it is indeed laborious to track down 20 or so references to add article titles or end­ing pages when a journal editor requires you to do so. Even if you know that the journal to which you plan to submit your manuscript uses a short form (no article titles, for example), you would still be wise to establish your reference list in the complete form. This is good practice because (1) the journal you selected may reject your manuscript, and you may then decide to submit the manuscript to another journal, perhaps one with more demanding requirements, and (2) it is more than likely that you will use some of the same references again, in later research papers, review papers (and most review journals demand full references), or books. When you submit a manuscript for publication, make sure that the references are presented according to the instructions for authors. If the references are radically different, the editor and referees may assume that this is a sign of previous rejection or, at best, obvious evidence of lack of care.

Although there is an almost infinite variety of reference styles, most jour­nals cite references in one of three general ways that may be referred to as name and year, alphabet-number, and citation order.

4.1. Name and Year System

The name and year system (often called the Harvard system) has been very popu­lar for many years and is used by many journals and books, including this one. Disciplines in which it is popular include the social sciences. Its big advantage is convenience to the author. Because the references are unnumbered, refer­ences can be added or deleted easily. No matter how many times the reference list is modified, “Smith and Jones (2015)” remains exactly that. If there are two or more “Smith and Jones (2015)” references, the problem is easily handled by listing the first as “Smith and Jones (2015a),” the second as “Smith and Jones (2015b),” and so on. The disadvantages of name and year relate to readers and publishers. The disadvantage to the reader occurs when (often in the introduc­tion) many references must be cited within one sentence or paragraph. Some­times the reader must jump over several lines of parenthetical references before he or she can again pick up the text. Even two or three references, cited together, can distract the reader. The disadvantage to the publisher is obvious: increased cost. When “Higginbotham, Hernandez, and Chowdhary (2015)” can be con­verted to “(7),” printing costs can be reduced.

Because some papers are written by an unwieldy number of authors, most journals that use name and year have an “et al.” (meaning “and others”) rule. Commonly, it works as follows. Names are always used in citing papers with either one or two authors; for example, “Smith (2015),” “Smith and Jones (2015).” If the paper has three authors, list all three the first time the paper is cited, for example, “Smith, Jones, and Nguyen (2015).” If the same paper is cited again, it can be shorted to “Smith et al. (2015).” When a cited paper has four or more authors, it should be cited as “Smith et al. (2015)” even in the first citation. In the references section, some journals prefer that all authors be listed (no matter how many); other journals cite only the first three authors and follow with “et al.”

4.2. Alphabet-Number System

This system, citation by number from an alphabetized list of references, is a modification of the name and year system. Citation by numbers keeps print­ing expenses within bounds; the alphabetized list, particularly if it is long, is relatively easy for authors to prepare and readers (especially librarians) to use.

Some authors who have habitually used name and year tend to dislike the alphabet-number system, claiming the citation of numbers cheats the reader. The reader should be told, the argument goes, the name of the person associated with the phenomenon; sometimes, the reader should also be told the date, on the grounds that a 1914 reference might be viewed differently than a 2014 reference.

Fortunately, these arguments can be overcome. As you cite references in the text, decide whether names or dates are important. If they are not (as is usually the case), use only the reference number: “Pretyrosine is quantitatively converted to phenylalanine under these conditions (13).” Ifyou want to feature the name of the author, do it within the context of the sentence: “The role of the carotid sinus in the regulation of respiration was discovered by Heymans (13).” If you want to feature the date, you can also do that within the sentence: “Strep­tomycin was first used in the treatment of tuberculosis in 1945 (13).”

4.3. Citation Order System

The citation order system is simply a system of citing the references (by num­ber) in the order in which they appear in the paper. This system avoids the substantial printing expense of the name and year system, and readers often like it because they can quickly refer to the references, if they so desire, in one-two-three order as they come to them in the text. It is a useful system for a journal that is basically a “note” journal, each paper containing only a few references. For long papers, with many references, citation order might not be a good system. It might not be good for the author because of the substantial renumbering chore that can result from adding or deleting references. It might not be ideal for the reader, because the non-alphabetical presentation of the reference list may result in separation of various references to works by the same author.

The first edition of this book (Day 1979, p. 40) stated that the alphabet- number system “seems to be slowly gaining ascendancy.” Soon thereafter, however, the first version of the “Uniform Requirements for Manuscripts Sub­mitted to Biomedical Journals” appeared, advocating the citation order system for the cooperating journals. Several hundred biomedical journals have adopted the “Uniform Requirements,” which have evolved over the years and have now been retitled “Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals” (International Committee of Medical Journal Editors 2014). Thus, it is not now clear which citation sys­tem, if any, will gain ascendancy. The “Uniform Requirements” document, as it still is often known, is impressive in so many ways that it has long had a powerful impact. It is in substantial agreement with a standard prepared by the American National Standards Institute (1977). With regard to literature cita­tion, however, other usage also remains strong.

5. TITLES AND INCLUSIVE PAGES

Should article titles be given in references? Normally, you must follow the style of the journal; if the journal allows a choice (and some do), we recommend that you give complete references. By denoting the overall subjects, the article titles make it simple for interested readers (and librarians) to decide whether they need to consult none, some, or all of the cited references.

The use of inclusive pagination (first and last page numbers) makes it easy for potential users to distinguish between one-page notes and 50-page review articles. Users may wish to proceed differently depending on the number of pages involved.

6. JOURNAL ABBREVIATIONS

Although journal styles vary widely, one aspect of reference citation has been standardized: abbreviations of journal names. As the result of widespread adoption of a standard (American National Standards Institute 1969), almost all of the major journals and secondary services now use the same system of abbreviation. Previously, most journals abbreviated journal names (significant printing expense can be avoided by abbreviation), but there was no unifor­mity. The Journal of the American Chemical Society was variously abbreviated to “J. Amer. Chem. Soc.,” “Jour. Am. Chem. Soc.,” “J.A.C.S.,” and so forth. These differing systems posed problems for authors and publishers alike. Now there is essentially only one system, and it is uniform. The word “Journal” is now always abbreviated “J.” (Some journals omit the periods after the abbreviations.) By noting a few of the rules, authors can abbreviate many journal titles, even unfa­miliar ones, without referring to a source list. It is helpful to know, for example, that all “ology” words are abbreviated at the “l.” (“Bacteriology” is abbreviated “Bacteriol.”; “Physiology” is abbreviated “Physiol.,” etc.) Thus, if one memo­rizes the abbreviations of words commonly used in titles, most journal titles can be abbreviated with ease. An exception to remember is that one-word titles (Science, Biochemistry) are never abbreviated.

Appendix 1 lists the abbreviations for commonly used words in periodical titles. If you are unsure how to abbreviate a journal title, you can often discern the correct abbreviation from a listing in a bibliographic database, from infor­mation in the journal, or from a previous citation of the journal. Abbreviations for the titles of many journals in the biomedical sciences and related fields can be obtained from the PubMed journals database (www.ncbi.nlm.nih.gov/nlm catalog/journals).

7. SOME TRENDS IN REFERENCE FORMAT

Not all journals abbreviate journal titles in references. For example, APA style (Publication Manual of the American Psychological Association 2010, p. 185) calls for stating periodical titles in full. More generally, journals may increasingly be including full journal titles in references. Earlier, when journals appeared only in print, publishers favored abbreviating journal titles because it saved valu­able space, thus saving paper costs or allowing more papers to be published. Today, with many journals appearing mainly or solely online, the space saved may be less of a consideration than are convenience to authors and clarity to readers. Writing out journal titles in full may serve especially well in journals that publish interdisciplinary papers and thus have readers who might not understand the abbreviations of some words in the titles of cited journals.

If a journal article has been published online, either exclusively or as well as in print, the publisher may have assigned it a Digital Object Identifier (DOI), which specifies a persistent link to its location on the Internet. If an article has a DOI, commonly it appears on the first page. Some reference formats include providing the DOI, if one exists, at the end of the reference. Additional infor­mation about DOIs is available at www.doi.org.

8. EXAMPLES OF DIFFERENT REFERENCE STYLES

So that you can see at a glance the differences among the three main systems of referencing, here are three sample references as they might appear in the references section of a journal. (In some journals, references in these systems will look somewhat different from those below because journals differ among themselves in items such as how, if at all, they use italics and boldface in refer­ences.)

8.1. Name and Year System

Alvarez GA, Suter D, and Kaiser R. 2015. Localization-delocalization transi­tion in the dynamics of dipolar-coupled nuclear spins. Science 349:846­848.

Bern C. 2015. Chagas’ disease. N. Engl. J. Med. 373:456-466.

Shipman WM. 2015. Handbook for science public information officers. Chicago: University of Chicago Press.

8.2. Alphabet-Number System

  • Alvarez, G. A., D. Suter, and R. Kaiser. 2015. Localization-delocalization transition in the dynamics of dipolar-coupled nuclear spins. Science 349:846-848.
  • Bern, C. 2015. Chagas’ disease. N. Engl. J. Med. 373:456-466.
  • Shipman, W. M. 2015. Handbook for science public information officers. Chicago: University of Chicago Press.

8.3. Citation Order System

  • Bern C. Chagas’ disease. N Engl J Med. 2015;373:456-66.
  • Shipman WM. Handbook for science public information officers. Chicago: University of Chicago Press, 2015.
  • Alvarez GA, Suter D, Kaiser R. Localization-delocalization transition in the dynamics of dipolar-coupled nuclear spins. Science. 2015;349:846-48.

In addition to its non-alphabetical arrangement of references, the citation order system differs from the others in its advocacy of eliminating periods after abbreviations (of journal titles, for example), periods after authors’ initials, and commas after authors’ surnames.

9. CITING ELECTRONIC MATERIAL

The Internet increasingly contains material appropriate for citation. In partic­ular, many scientific papers now are appearing in electronic journals or being posted online as well as appearing in print. In addition, some reports, databases, and other items accessed online can be valid to cite.

Accordingly, formats have been developed, and are continuing to be devel­oped, for citing electronic materials. These formats appear in recent editions of style manuals and in the instructions to authors of some journals. If you wish to cite electronic material, begin by consulting the instructions to authors of your target journal. These instructions may show the format(s) to use or direct you to a source of guidance in print or online. Also, you may find it useful to look in the journal for examples of references listing electronic materials.

10. ONE MORE REASON TO CITE CAREFULLY

Accurate citation is part of being a rigorous researcher. Whether you use refer­ence management software or prepare references by traditional means, ensure that the right reference is cited in the right place, that all information in every citation is accurate, and that content from the cited sources is accurately reported. Such accuracy is important in ensuring that your paper is useful to readers.

And, on a very practical note, careful citation helps keep you from alienating those evaluating your paper. Commonly, some of the referees (peer reviewers) chosen by editors are researchers whose work your paper cites. If your refer­ence section lists their writings inaccurately, or if your text misrepresents their findings or conclusions, they might well question whether you are a careful researcher.

So, take the same care with your references that you do with other aspects of your work. The effort is likely to serve you well.

Source: Gastel Barbara, Day Robert A. (2016), How to Write and Publish a Scientific Paper , Greenwood; 8th edition.

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Computer Science > Artificial Intelligence

Title: self-discover: large language models self-compose reasoning structures.

Abstract: We introduce SELF-DISCOVER, a general framework for LLMs to self-discover the task-intrinsic reasoning structures to tackle complex reasoning problems that are challenging for typical prompting methods. Core to the framework is a self-discovery process where LLMs select multiple atomic reasoning modules such as critical thinking and step-by-step thinking, and compose them into an explicit reasoning structure for LLMs to follow during decoding. SELF-DISCOVER substantially improves GPT-4 and PaLM 2's performance on challenging reasoning benchmarks such as BigBench-Hard, grounded agent reasoning, and MATH, by as much as 32% compared to Chain of Thought (CoT). Furthermore, SELF-DISCOVER outperforms inference-intensive methods such as CoT-Self-Consistency by more than 20%, while requiring 10-40x fewer inference compute. Finally, we show that the self-discovered reasoning structures are universally applicable across model families: from PaLM 2-L to GPT-4, and from GPT-4 to Llama2, and share commonalities with human reasoning patterns.

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Reproductive rights in America

Research at the heart of a federal case against the abortion pill has been retracted.

Selena Simmons-Duffin

Selena Simmons-Duffin

references scientific paper

The Supreme Court will hear the case against the abortion pill mifepristone on March 26. It's part of a two-drug regimen with misoprostol for abortions in the first 10 weeks of pregnancy. Anna Moneymaker/Getty Images hide caption

The Supreme Court will hear the case against the abortion pill mifepristone on March 26. It's part of a two-drug regimen with misoprostol for abortions in the first 10 weeks of pregnancy.

A scientific paper that raised concerns about the safety of the abortion pill mifepristone was retracted by its publisher this week. The study was cited three times by a federal judge who ruled against mifepristone last spring. That case, which could limit access to mifepristone throughout the country, will soon be heard in the Supreme Court.

The now retracted study used Medicaid claims data to track E.R. visits by patients in the month after having an abortion. The study found a much higher rate of complications than similar studies that have examined abortion safety.

Sage, the publisher of the journal, retracted the study on Monday along with two other papers, explaining in a statement that "expert reviewers found that the studies demonstrate a lack of scientific rigor that invalidates or renders unreliable the authors' conclusions."

It also noted that most of the authors on the paper worked for the Charlotte Lozier Institute, the research arm of anti-abortion lobbying group Susan B. Anthony Pro-Life America, and that one of the original peer reviewers had also worked for the Lozier Institute.

The Sage journal, Health Services Research and Managerial Epidemiology , published all three research articles, which are still available online along with the retraction notice. In an email to NPR, a spokesperson for Sage wrote that the process leading to the retractions "was thorough, fair, and careful."

The lead author on the paper, James Studnicki, fiercely defends his work. "Sage is targeting us because we have been successful for a long period of time," he says on a video posted online this week . He asserts that the retraction has "nothing to do with real science and has everything to do with a political assassination of science."

He says that because the study's findings have been cited in legal cases like the one challenging the abortion pill, "we have become visible – people are quoting us. And for that reason, we are dangerous, and for that reason, they want to cancel our work," Studnicki says in the video.

In an email to NPR, a spokesperson for the Charlotte Lozier Institute said that they "will be taking appropriate legal action."

Role in abortion pill legal case

Anti-abortion rights groups, including a group of doctors, sued the federal Food and Drug Administration in 2022 over the approval of mifepristone, which is part of a two-drug regimen used in most medication abortions. The pill has been on the market for over 20 years, and is used in more than half abortions nationally. The FDA stands by its research that finds adverse events from mifepristone are extremely rare.

Judge Matthew Kacsmaryk, the district court judge who initially ruled on the case, pointed to the now-retracted study to support the idea that the anti-abortion rights physicians suing the FDA had the right to do so. "The associations' members have standing because they allege adverse events from chemical abortion drugs can overwhelm the medical system and place 'enormous pressure and stress' on doctors during emergencies and complications," he wrote in his decision, citing Studnicki. He ruled that mifepristone should be pulled from the market nationwide, although his decision never took effect.

references scientific paper

Matthew Kacsmaryk at his confirmation hearing for the federal bench in 2017. AP hide caption

Matthew Kacsmaryk at his confirmation hearing for the federal bench in 2017.

Kacsmaryk is a Trump appointee who was a vocal abortion opponent before becoming a federal judge.

"I don't think he would view the retraction as delegitimizing the research," says Mary Ziegler , a law professor and expert on the legal history of abortion at U.C. Davis. "There's been so much polarization about what the reality of abortion is on the right that I'm not sure how much a retraction would affect his reasoning."

Ziegler also doubts the retractions will alter much in the Supreme Court case, given its conservative majority. "We've already seen, when it comes to abortion, that the court has a propensity to look at the views of experts that support the results it wants," she says. The decision that overturned Roe v. Wade is an example, she says. "The majority [opinion] relied pretty much exclusively on scholars with some ties to pro-life activism and didn't really cite anybody else even or really even acknowledge that there was a majority scholarly position or even that there was meaningful disagreement on the subject."

In the mifepristone case, "there's a lot of supposition and speculation" in the argument about who has standing to sue, she explains. "There's a probability that people will take mifepristone and then there's a probability that they'll get complications and then there's a probability that they'll get treatment in the E.R. and then there's a probability that they'll encounter physicians with certain objections to mifepristone. So the question is, if this [retraction] knocks out one leg of the stool, does that somehow affect how the court is going to view standing? I imagine not."

It's impossible to know who will win the Supreme Court case, but Ziegler thinks that this retraction probably won't sway the outcome either way. "If the court is skeptical of standing because of all these aforementioned weaknesses, this is just more fuel to that fire," she says. "It's not as if this were an airtight case for standing and this was a potentially game-changing development."

Oral arguments for the case, Alliance for Hippocratic Medicine v. FDA , are scheduled for March 26 at the Supreme Court. A decision is expected by summer. Mifepristone remains available while the legal process continues.

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AI gone wild —

Scientists aghast at bizarre ai rat with huge genitals in peer-reviewed article, it's unclear how such egregiously bad images made it through peer-review..

Beth Mole - Feb 15, 2024 11:16 pm UTC

An actual laboratory rat, who is intrigued.

Appall and scorn ripped through scientists' social media networks Thursday as several egregiously bad AI-generated figures circulated from a peer-reviewed article recently published in a reputable journal. Those figures—which the authors acknowledge in the article's text were made by Midjourney—are all uninterpretable. They contain gibberish text and, most strikingly, one includes an image of a rat with grotesquely large and bizarre genitals, as well as a text label of "dck."

AI-generated Figure 1 of the paper. This image is supposed to show spermatogonial stem cells isolated, purified, and cultured from rat testes.

The article in question is titled "Cellular functions of spermatogonial stem cells in relation to JAK/STAT signaling pathway," which was authored by three researchers in China, including the corresponding author Dingjun Hao of Xi’an Honghui Hospital. It was published online Tuesday in the journal Frontiers in Cell and Developmental Biology.

Frontiers did not immediately respond to Ars' request for comment, but we will update this post with any response.

Figure 2 is supposed to be a diagram of the JAK-STAT signaling pathway.

But the rat's package is far from the only problem. Figure 2 is less graphic but equally mangled. While it's intended to be a diagram of a complex signaling pathway, it instead is a jumbled mess. One scientific integrity expert questioned whether it provided an overly complicated explanation of "how to make a donut with colorful sprinkles." Like the first image, the diagram is rife with nonsense text and baffling images. Figure 3 is no better, offering a collage of small circular images that are densely annotated with gibberish. The image is supposed to provide visual representations of how the signaling pathway from Figure 2 regulates the biological properties of spermatogonial stem cells.

Some scientists online questioned whether the article's text was also AI-generated. One user noted that AI detection software determined that it was likely to be AI-generated; however, as Ars has reported previously, such software is unreliable .

Figure 3 is supposed to show the regulation of biological properties of spermatogonial stem cells by JAK/STAT signaling pathway.

The images, while egregious examples, highlight a growing problem in scientific publishing. A scientist's success relies heavily on their publication record, with a large volume of publications, frequent publishing, and articles appearing in top-tier journals, all of which earn scientists more prestige. The system incentivizes less-than-scrupulous researchers to push through low-quality articles, which, in the era of AI chatbots, could potentially be generated with the help of AI. Researchers worry that the growing use of AI will make published research less trustworthy. As such, research journals have recently set new authorship guidelines for AI-generated text to try to address the problem. But for now, as the Frontiers article shows, there are clearly some gaps.

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  1. Scientific Style and Format Online

    Scientific Style and Format presents three systems for referring to references (also known as citations) within the text of a journal article, book, or other scientific publication: 1) citation-sequence; 2) name-year; and 3) citation-name. These abbreviated references are called in-text references.

  2. How to Cite a Journal Article

    To cite an article from an academic journal, you need an in-text citation and a corresponding reference listing the name (s) of the author (s), the publication date, the article title and journal name, the volume and issue numbers, the page range, and the URL or DOI. Different citation styles present this information differently.

  3. Formatting References for Scientific Manuscripts

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  4. Citation Styles Guide

    A citation style is a set of guidelines on how to cite sources in your academic writing. You always need a citation whenever you quote, paraphrase, or summarize a source to avoid plagiarism. How you present these citations depends on the style you follow. Scribbr's citation generator can help!

  5. References in Research

    References in Research Definition: References in research are a list of sources that a researcher has consulted or cited while conducting their study. They are an essential component of any academic work, including research papers, theses, dissertations, and other scholarly publications. Types of References

  6. References: How to Cite and List Correctly

    Referencing is the name given to the method of showing and acknowledging the sources from which the author has obtained ideas or information. Different referencing systems have evolved depending upon the nature of disciplines. For example, the way we handle reference sources in linguistics would be different from that required in chemistry.

  7. How To Write Your References Quickly And Easily

    In general, a reference will include authors' names and initials, the title of the article, name of the journal, volume and issue, date, page numbers and DOI. On ScienceDirect, articles are linked to their original source (if also published on ScienceDirect) or to their Scopus record, so including the DOI can help link to the correct article.

  8. Harvard Science Referencing Style Guide

    Harvard Science Referencing Style Guide. When preparing an assignment or research paper, it is vital that you acknowledge the resources you have used, as failure to do so constitutes plagiarism. Also, readers may need to be able to retrieve the source information. Your sources must be cited in the text of your assignment or research paper (in ...

  9. The Importance of Proper Citation of References in Biomedical Articles

    In scientific circles, the reference is the information that is necessary to the reader in identifying and finding used sources. The basic rule when listing the sources used is that references must be accurate, complete and should be consistently applied. ... Title of the scientific paper contains a brief description of the content. Impact ...

  10. Research Guides: Science Fair Resources: Citing Your Sources

    APA style stipulates that authors use brief references in the text of a work with full bibliographic details supplied in a Reference List (typically at the end of your document). In text, the reference is very brief and usually consists simply of the author's last name and a date.For example:

  11. What citation style to use for science [Updated 2023]

    What citation style should you use for a science paper? In this post, we explore the most frequently used citation styles for science. We cover APA, IEEE, ACS, and others and provide examples of each style. #1 APA

  12. The Principles of Biomedical Scientific Writing: Citation

    A good citation adds to the scientific prestige of the paper and makes it more valuable to the reader. The citation has three basic elements: quoting from others, an in-text reference to the source, and bibliographic details of the source.

  13. Accessing Scientific Literature and Referencing

    A reference list is a list of all the sources that you have used as in-text references in your scientific paper that enables the reader of your work to locate and verify the sources you have use. Here are two basic formats for a reference list: an alphabetical listing by first author's last name (author-date system)

  14. How to Cite a Scientific Paper in APA

    A scientific paper in APA has a simple citation format for in-text citations. The following information appears in parentheses after the text that cites the source, in what is known as a parenthetical citation: (Author's Last Name, Year)

  15. How to write "references" in scientific journal articles

    Some of the important reasons to cite references include: i. to acknowledge others work, ii. to give credit to the original source of work, iii. to direct readers to the original source of the...

  16. Formatting guide

    A useful set of articles providing general advice about writing and submitting scientific papers can be found on the ... All textual material of the paper (including references, tables, figure ...

  17. How To Cite a Research Paper in 2024: Citation Styles Guide

    As such, this article should serve as your guide on how to reference a research paper in popular formats: APA, MLA, Chicago/Turabian, and the IEEE style. A list of digital tools that can make citation easier and a quick tutorial will also be provided.

  18. Instructions for preparing an initial manuscript

    The full reference list will be included online in the HTML version of the main paper and in the supplementary materials PDF, but references cited only in the supplementary materials will be suppressed in print and in the main-paper PDF. Each reference should have a unique number; do not combine references or embed references in notes.

  19. Citing References in Scientific Research Papers

    Introduction. It is important to properly and appropriately cite references in scientific research papers in order to acknowledge your sources and give credit where credit is due. Science moves forward only by building upon the work of others. There are, however, other reasons for citing references in scientific research papers.

  20. How to write a reference list in scientific papers

    Steps to boose the reference list. For example, when you need to boost your reference list relatively quickly, some tricks may come in hand.. Although you probably already know your core literature by heart, science and practice are progressing with each new academic article and scholarly paper opening up new horizons and proposing new conceptual frameworks and models.

  21. References

    The References (or Bibliography) section should list all the sources of information that were used in the poster. This section appears at the end of the poster. The References section ( Figs. 2 and 8) typically contains all journal articles (i.e., primary sources) but it can also contain secondary sources (e.g., newspapers, documentaries ...

  22. Google Scholar

    Google Scholar provides a simple way to broadly search for scholarly literature. Search across a wide variety of disciplines and sources: articles, theses, books, abstracts and court opinions.

  23. How to Cite the References of a Scientific Paper

    When a cited paper has four or more authors, it should be cited as "Smith et al. (2015)" even in the first citation. In the references section, some journals prefer that all authors be listed (no matter how many); other journals cite only the first three authors and follow with "et al.". 4.2. Alphabet-Number System.

  24. Physics-based early warning signal shows that AMOC is on ...

    The Atlantic meridional overturning circulation (AMOC) effectively transports heat and salt through the global ocean and strongly modulates regional and global climate.Continuous section measurements of the AMOC, available since 2004 at 26°N from the RAPID-MOCHA array (), have shown that the AMOC strength has decreased by a few Sverdrups (1 Sv = 10 6 m 3 s −1) from 2004 to 2012, and ...

  25. [2402.03620] Self-Discover: Large Language Models Self-Compose

    We introduce SELF-DISCOVER, a general framework for LLMs to self-discover the task-intrinsic reasoning structures to tackle complex reasoning problems that are challenging for typical prompting methods. Core to the framework is a self-discovery process where LLMs select multiple atomic reasoning modules such as critical thinking and step-by-step thinking, and compose them into an explicit ...

  26. The abortion pill case on its way to the Supreme Court cites a

    A scientific paper that raised concerns about the safety of the abortion pill mifepristone was retracted by its publisher this week. The study was cited three times by a federal judge who ruled ...

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    The first figure in the paper, the one containing the rat, drew immediate attention as scientists began widely sharing it and commenting on it on social media platforms, including Bluesky and X ...