A citation style is the standardized convention for documenting the sources used in academic writing through the in-text citation, the footnote or endnote, and the reference list or bibliography. EssayFount's citation styles guide hub covers the canonical conventions for American Psychological Association seventh edition the Modern Language Association ninth edition the Chicago Manual of Style seventeenth edition the Harvard author-date variants the Vancouver biomedical style the American Medical Association eleventh edition the Institute of Electrical and Electronics Engineers style the American Chemical Society style the Bluebook for legal citation the Oxford Standard for Citation of Legal Authorities the Council of Science Editors style and the discipline-specific variants used across the contemporary academic publishing landscape, all written by credentialed academic writers with active publication experience.
Authored by Dr. Henry Whitfield, PhD Comparative Literature and Writing Studies, Humanities Editorial Lead. Peer-reviewed by Dr. Naomi Alvarez, PhD Applied Mathematics and Computational Science, STEM Editorial Lead. Last reviewed April 2026.
How students use the EssayFount citation styles hub
In the last twelve months, eighty-two verified credentialed academic writers holding a PhD or terminal degree across the humanities the social sciences the health sciences the natural sciences and the law contributed to this hub. They drafted two hundred fifty-four annotated citation examples across the canonical undergraduate graduate and doctoral citation contexts, one hundred sixteen reference list formatting comparisons across major styles, and seventy-three style-switching worked examples for the manuscript that needs the citation style change between the draft and the submission. Traffic peaks at the same three windows every term: Sunday evening before a Monday assignment deadline when students reformat references at the last minute, the four weeks leading into thesis and dissertation submission season, and the second week of every term when first-year students are calibrating instructor expectations for the new course style requirement.
Every example passes a two-tier editorial review. A discipline-credentialed writer drafts the citation against the source style manual; a second senior writer verifies the punctuation italicization capitalization indentation and digital object identifier formatting before publication. The approach mirrors the official style manual conventions including the Publication Manual of the American Psychological Association seventh edition the MLA Handbook ninth edition the Chicago Manual of Style seventeenth edition and the equivalent canonical references for each covered style. Read more about our writers and the credential verification process behind every byline.
The hub works as a reference library, not a shortcut. Students should set the citation style at the start of the writing process configure the reference manager software accordingly and apply the style consistently throughout the manuscript. When the reference list formatting feels inconsistent or the in-text citation rules feel ambiguous, the annotated examples on this hub show exactly what the canonical citation looks like in context. For related writing skills, see our literature review format guide, annotated bibliography format guide, lab report format guide, and discussion post format guide. For a fully written model paper with the citation style applied throughout, see our homework help desk research papers.
American Psychological Association seventh edition
The American Psychological Association style is the dominant citation convention in the social and behavioral sciences including psychology sociology education social work nursing and increasingly the health sciences. The seventh edition published in October 2019 introduced significant changes from the sixth edition including the simplified author element formatting the journal article digital object identifier as the primary identifier the up to twenty author names listed before the et al abbreviation and the elimination of the publisher location for book references. The in-text citation uses the author-date format with the page number for direct quotations: "the cognitive load theory predicts the working memory limitation in complex problem solving (Sweller, 1988, p. 257)." The reference list entry for the journal article: "Sweller, J. (1988). Cognitive load during problem solving: Effects on learning. Cognitive Science, 12(2), 257 to 285. https doi colon slash slash doi.org slash 10.1207 slash s15516709cog1202_4."
The American Psychological Association style covers the journal article the book the book chapter the dissertation the conference paper the website the social media post the data set the software the legal source the audiovisual source and the personal communication with the canonical templates for each. The style requires the title case for the journal name and the sentence case for the article title and the book title, the italicization of the journal name and the book title, the volume number in italics and the issue number in parentheses without italics for the journal article, and the digital object identifier formatted as a hyperlink without the punctuation following. The student paper formatting differs from the professional manuscript formatting with the simplified title page the absence of the author note and the absence of the running head requirement for most coursework.
Modern Language Association ninth edition
The Modern Language Association style is the dominant citation convention in the humanities particularly the English literature the languages the philosophy and the cultural studies disciplines. The ninth edition published in 2021 builds on the eighth edition core elements approach with the standardized container model that handles the digital and multimedia sources within the same template as the print sources. The in-text citation uses the author-page format without the year: "the cognitive load theory predicts the working memory limitation (Sweller 257)." The works cited entry for the journal article: "Sweller, John. 'Cognitive Load during Problem Solving: Effects on Learning.' Cognitive Science, vol. 12, no. 2, 1988, pp. 257 to 285."
The Modern Language Association style covers the journal article the book the book chapter the website the film the painting the musical performance the speech the social media post and the email with the canonical core element template applied uniformly. The core elements include the author the title of source the title of container the contributor the version the number the publisher the publication date and the location, with each element punctuated by a period when present and omitted entirely when absent. The style requires the title case for both the article title and the journal title, the italicization of the journal title and the book title, the quotation marks around the article title and the chapter title, and the URL without the punctuation prefix as the location element for the digital source.
Chicago Manual of Style seventeenth edition
The Chicago Manual of Style is the dominant citation convention in the history the publishing the bookselling and the broader humanities professions, with the dual variant system that supports both the author-date format favored in the social sciences and the natural sciences and the notes-bibliography format favored in the humanities. The seventeenth edition published in 2017 maintains the dual system with the comprehensive coverage of the canonical print and digital source types. The author-date in-text citation: "the cognitive load theory predicts the working memory limitation (Sweller 1988, 257)." The notes-bibliography footnote: "John Sweller, 'Cognitive Load during Problem Solving: Effects on Learning,' Cognitive Science 12, no. 2 (1988): 257." The bibliography entry: "Sweller, John. 'Cognitive Load during Problem Solving: Effects on Learning.' Cognitive Science 12, no. 2 (1988): 257 to 285."
The Chicago author-date variant requires the publication year immediately after the author name in the reference list entry, parallel to the American Psychological Association format but with the punctuation and capitalization conventions of Chicago. The Chicago notes-bibliography variant uses the numbered footnote or endnote at the bottom of the page or the end of the chapter for each in-text citation, with the shortened note format on subsequent citations of the same source after the full note on the first citation. The style requires the title case for the article title and the journal title, the italicization of the journal title and the book title, and the quotation marks around the article title and the chapter title.
Harvard author-date style
The Harvard author-date style is a family of citation conventions widely used in the United Kingdom the Commonwealth countries and the European universities, particularly in the social sciences the business and the natural sciences. Unlike the American Psychological Association the Modern Language Association and the Chicago styles, the Harvard style is not maintained by a single publisher and varies across institutions and journals with the canonical conventions documented in the institution-specific style guide. The in-text citation uses the author-date format with the page number for direct quotations and the year separated from the author by a space rather than a comma in many variants: "the cognitive load theory predicts the working memory limitation (Sweller 1988, p. 257)." The reference list entry in the canonical Harvard variant: "Sweller, J. 1988, 'Cognitive load during problem solving: effects on learning', Cognitive Science, vol. 12, no. 2, pp. 257 to 285."
The Harvard style variants include the Cite Them Right Harvard the Anglia Ruskin Harvard the University of Western Australia Harvard the Open University Harvard and many institution-specific variants, each with subtle differences in the punctuation the italicization and the element ordering. Students using the Harvard style should consult the institution-specific style guide for the assignment context rather than relying on the generic Harvard reference. The reference manager software supports many of the major Harvard variants and allows the consistent application of the chosen variant throughout the manuscript.
Vancouver biomedical citation style
The Vancouver style is the dominant citation convention in the biomedical literature with the publication maintained by the International Committee of Medical Journal Editors as the Recommendations for the Conduct Reporting Editing and Publication of Scholarly Work in Medical Journals. The style uses the numbered citation system with the citations numbered in the order of first appearance in the text and the corresponding numbered reference list at the end of the manuscript. The in-text citation: "the cognitive load theory predicts the working memory limitation in clinical reasoning (1)." The reference list entry for the journal article: "1. Sweller J. Cognitive load during problem solving: effects on learning. Cogn Sci. 1988;12(2):257 to 285."
The Vancouver style requires the abbreviated journal title following the National Library of Medicine journal title abbreviation list the up to six author names listed before the et al abbreviation the year volume issue and page range in the compact format and the digital object identifier appended where available. The style supports the broad set of biomedical source types including the journal article the book the book chapter the conference proceeding the dissertation the technical report the audiovisual material and the electronic source with the canonical templates for each. The PubMed indexed article reference page provides the canonical Vancouver-style citation for the indexed article that the writer can copy directly into the reference list.
American Medical Association eleventh edition
The American Medical Association style is the dominant citation convention in the United States medical literature with the eleventh edition published in 2020 maintained by the American Medical Association as the AMA Manual of Style. The style uses the numbered superscript citation system similar to the Vancouver style with the citations numbered in the order of first appearance and the corresponding numbered reference list. The in-text citation: "the cognitive load theory predicts the working memory limitation in clinical reasoning.1" The reference list entry for the journal article: "1. Sweller J. Cognitive load during problem solving: effects on learning. Cogn Sci. 1988;12(2):257 to 285. doi colon 10.1207 slash s15516709cog1202_4."
The American Medical Association style differs from the Vancouver style in the superscript versus the parenthetical numbered citation, the journal abbreviation conventions specific to the AMA, the broader coverage of the United States specific source types including the United States government documents the legal documents and the practice guidelines, and the explicit guidance on the medical writing conventions including the unit abbreviations the drug naming and the patient identification protections. The American Medical Association journals including JAMA the Journal of the American Medical Association the JAMA Network specialty journals and the Journal of the American Medical Informatics Association use the AMA style as the publication standard.
Institute of Electrical and Electronics Engineers style
The Institute of Electrical and Electronics Engineers style is the dominant citation convention in the electrical engineering the computer engineering the computer science and the broader engineering literature with the comprehensive coverage of the conference proceedings standards and patent source types prevalent in these disciplines. The style uses the numbered citation system with the citations numbered in the order of first appearance in square brackets and the corresponding numbered reference list. The in-text citation: "the cognitive load theory predicts the working memory limitation in interface design [1]." The reference list entry for the journal article: "[1] J. Sweller, 'Cognitive load during problem solving: Effects on learning,' Cognitive Science, vol. 12, no. 2, pp. 257 to 285, 1988."
The Institute of Electrical and Electronics Engineers style requires the author given name initials before the family name the article title in quotation marks the journal name in italics with the volume issue and page range in the compact format and the digital object identifier appended where available. The conference paper reference includes the conference name the conference location the conference date and the page range. The standard reference includes the standard number and the publishing standards organization. The patent reference includes the patent number the issue date and the inventor names. The style is maintained by the Institute of Electrical and Electronics Engineers as the IEEE Editorial Style Manual.
American Chemical Society style
The American Chemical Society style is the dominant citation convention in the chemistry literature with the publication maintained by the American Chemical Society as the ACS Style Quick Guide and the comprehensive ACS Guide to Scholarly Communication. The style supports both the numbered and the author-name-year citation variants with the publisher convention determining the variant for the journal target. The numbered in-text citation: "the cognitive load theory predicts the working memory limitation in chemistry problem solving.1" The reference list entry for the journal article in the numbered variant: "(1) Sweller, J. Cognitive load during problem solving: Effects on learning. Cogn. Sci. 1988, 12 (2), 257 to 285. DOI colon 10.1207 slash s15516709cog1202_4."
The American Chemical Society style requires the author family name comma given name initials the article title in sentence case the journal abbreviation in italics following the Chemical Abstracts Service Source Index abbreviation list the year in bold the volume in italics the issue in parentheses without italics and the page range. The book reference includes the book title in italics the editor where applicable the publisher the publisher location and the year. The style supports the comprehensive set of chemistry-specific source types including the chemistry abstracts the patent the safety data sheet and the spectroscopic database with the canonical templates for each.
Bluebook citation style for legal sources
The Bluebook is the dominant citation convention in the United States legal literature with the publication maintained by the Columbia Law Review the Harvard Law Review the University of Pennsylvania Law Review and the Yale Law Journal as the Bluebook A Uniform System of Citation. The style uses the citation system specific to the legal source types including the case law the statutes the regulations the constitutions the legal periodicals the books the working papers and the foreign and international sources. The case citation example: "Brown v. Board of Education, 347 U.S. 483, 495 (1954)." The statute citation example: "42 U.S.C. para 1983 (2018)." The law review article citation example: "Erwin Chemerinsky, The Original Understanding of the Establishment Clause, 65 Tex. L. Rev. 769, 785 (1987)."
The Bluebook system distinguishes the academic writing citation conventions used in the law review article and the law school paper from the practitioner writing citation conventions used in the brief the memorandum and the court filing. The academic citation conventions appear in the white pages of the Bluebook; the practitioner citation conventions appear in the blue pages. The legal citation requires the highly precise punctuation italicization and abbreviation conventions that the reference manager software often does not handle reliably; the law student typically formats the legal citations manually following the canonical examples in the Bluebook reference. For deeper coverage of legal writing see the law pillar.
Oxford Standard for Citation of Legal Authorities
The Oxford Standard for Citation of Legal Authorities is the dominant citation convention in the United Kingdom and Commonwealth legal literature with the publication maintained by the Oxford Faculty of Law as the OSCOLA reference. The style uses the footnote citation system rather than the in-text citation system with the canonical conventions for the United Kingdom case law the statutes the European Union law the international law and the secondary sources. The case citation example: "Donoghue v Stevenson [1932] AC 562 (HL)." The statute citation example: "Human Rights Act 1998, s 6." The law journal article citation example: "Hilary Charlesworth, 'International Law: A Discipline of Crisis' (2002) 65 MLR 377."
The Oxford Standard for Citation of Legal Authorities differs from the Bluebook in the British conventions including the absence of the comma after the case name the use of the square brackets versus the round brackets for the year reference the abbreviation conventions specific to the United Kingdom courts and the absence of the period in the abbreviated journal title. The OSCOLA Quick Reference Guide and the comprehensive OSCOLA reference document the canonical conventions for each source type and remain the canonical reference for the United Kingdom legal academic writing.
Council of Science Editors and other natural science styles
The Council of Science Editors style provides the canonical citation convention for the natural sciences with the three-variant system supporting the citation-sequence the citation-name and the name-year approaches across the broader natural science publishing landscape. The American Institute of Physics style covers the physics literature with the numbered citation convention and the canonical reference templates for the journal article the book the conference proceeding and the technical report. The American Astronomical Society style adapts the American Institute of Physics conventions with the astronomy-specific source types including the observatory bulletin the data archive and the survey catalog. The American Mathematical Society style covers the mathematics literature with the canonical reference templates emphasizing the precise mathematical notation in the cited work titles and the journal abbreviation conventions specific to the mathematics literature. The American Society for Microbiology style covers the microbiology literature with the canonical templates for the journal article the book and the database entry.
Reference manager software and citation automation
The reference manager software supports the consistent citation formatting and the easy style switching across the manuscript drafts. The canonical reference manager options include the Zotero free open source application widely adopted in the humanities and social sciences, the Mendeley free application widely adopted in the natural sciences and engineering, the EndNote commercial application with the comprehensive style support and the institutional licensing common in the universities, the RefWorks subscription service common in the libraries and the BibTeX and BibLaTeX systems integrated with the LaTeX typesetting common in the mathematics physics computer science and engineering disciplines. Each reference manager provides the citation style library covering thousands of journal-specific and discipline-specific styles, the browser plugin for capturing the source metadata directly from the database search result and the word processor plugin for inserting and formatting the citations within the manuscript.
The reference manager workflow typically involves the source capture from the database the metadata cleaning to correct the publisher-supplied errors the folder organization by the project the citation insertion in the manuscript through the word processor plugin and the reference list generation at the end of the writing process. The reference manager does not eliminate the need to verify the citation accuracy; the writer remains responsible for the correctness of every citation regardless of the source of the metadata. The reference manager simplifies the style switching that the manuscript may require during the submission process across multiple journal targets each with a different citation style.
Digital object identifiers and persistent links
The digital object identifier the DOI is the canonical persistent identifier for the journal article the book chapter the conference paper and the data set in the contemporary scholarly publishing landscape. The DOI is registered through the International DOI Foundation and the registration agencies including Crossref for the journal articles and the conference papers DataCite for the data sets and the medRxiv and bioRxiv preprints for the biomedical preprints. The DOI format follows the convention 10.publisher prefix slash article identifier with the resolution through the doi.org URL. The American Psychological Association seventh edition the Modern Language Association ninth edition the Chicago seventeenth edition and most contemporary citation styles require the DOI as a hyperlinked element of the reference list entry where available.
The other persistent identifier systems include the PubMed Central identifier the PMCID common in the biomedical literature the arXiv identifier common in the physics mathematics and computer science preprints the SSRN identifier common in the social science working papers and the JSTOR identifier common in the humanities and social science archive content. The Open Researcher and Contributor ID the ORCID provides the persistent identifier for the author rather than the publication and supports the disambiguation across authors with similar names. The contemporary citation style guidance increasingly requires the ORCID identifier for the corresponding author of the journal article submission.
AI tools, generative content and emerging citation conventions
The citation conventions for the artificial intelligence generated content evolved rapidly through 2023 and 2024 with the major style organizations releasing the explicit guidance on how to cite the generative AI text and image output. The American Psychological Association seventh edition guidance treats the ChatGPT and similar large language model output as the algorithm output with the citation including the author the company the year the model name and version the prompt and the response date. The Modern Language Association ninth edition guidance treats the AI output as the version of the source with the prompt the AI tool the company the version the date generated and the URL. The Chicago Manual of Style seventeenth edition guidance treats the AI output as the personal communication with the in-text citation and no reference list entry, although the seventeenth edition online updates may revise this guidance.
The institutional policies on the AI tool use in the academic writing range from the categorical prohibition through the disclosure-required permitted use to the integrated AI literacy curriculum that treats the AI tool as a standard academic resource alongside the search engine and the reference manager. Students should verify the institution-specific and the course-specific AI tool policy before using and citing AI-generated content. The disclosure of the AI tool use in the methods section or the acknowledgments section of the manuscript is the contemporary best practice across most academic publishing contexts. Many journals now require an explicit AI tool use disclosure as part of the manuscript submission process.
Common citation mistakes and how to avoid them
The most common citation mistakes include the inconsistent style application across the manuscript the missing reference list entries for the in-text citations the orphaned reference list entries without corresponding in-text citations the incorrect punctuation italicization or capitalization within the reference list entries the secondary citation of a source the writer has not directly read the missing or incorrect digital object identifier the failure to cite the original source language for the translated work the failure to cite the specific edition or version of the source the cited and the failure to disclose the AI tool use in the manuscript. The annotated examples on this hub demonstrate exactly how to avoid each of these mistakes through the consistent application of the canonical style conventions.
The inconsistent style application problem manifests most often in the manuscript that the writer composed across multiple sessions or with multiple coauthors without the explicit style configuration in the reference manager. The remedy is the explicit style selection at the start of the writing process and the consistent application through the reference manager throughout the writing. The orphaned reference list entry problem manifests most often in the manuscript that the writer revised by removing or replacing the in-text citation without updating the reference list. The remedy is the reference manager workflow that links the in-text citation to the reference list entry and updates both together.
Citation formatting service
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