APA, MLA, and Chicago are the three most common citation styles in academic writing, each developed for a specific set of disciplines. Choosing the wrong one can cost marks β€” understanding the key differences helps you format correctly the first time.

APA 7th Edition β€” Science, Psychology, and Social Sciences

APA (American Psychological Association) style emphasises the date of publication, reflecting the fast-moving nature of scientific research. In-text citations always include the author's last name and year β€” (Smith, 2022) β€” so readers immediately know how current a source is. The reference list at the end of the paper is organised alphabetically and uses hanging indents.

APA 7 (the current edition, released 2019) simplified several rules: you no longer need to include the location of the publisher for books, running heads are required only for manuscripts submitted for publication, and DOIs are formatted as hyperlinks (https://doi.org/…). For sources with up to 20 authors, list all of them; for 21 or more, list the first 19, an ellipsis, and the last author.

MLA 9th Edition β€” Humanities and Literature

MLA (Modern Language Association) style is used in literary studies, languages, and the humanities. It emphasises the author and page number in in-text citations β€” (Atwood 47) β€” because humanities scholars frequently quote specific passages. MLA uses a 'Works Cited' page rather than a 'Reference List.'

MLA 9 (released 2021) introduced a container model: every source exists inside a larger container (a journal, a database, a website) and you list the container name in italics after the article title. This makes it easier to cite the same article found through different databases. MLA 9 also dropped the requirement to include a URL access date for most web sources.

Chicago 17th Edition β€” History and the Humanities

Chicago style comes in two flavours: Notes-Bibliography (used in history, art, and literature) and Author-Date (used in the sciences and social sciences). The Notes-Bibliography system uses footnotes or endnotes in the body of the paper, plus a full bibliography at the end. This style is favoured when authors need to include detailed commentary in notes without breaking the flow of the main text.

The key distinction between the footnote and bibliography entry is the author-name order: footnotes use First Last (e.g., Jane Smith) while bibliography entries use Last, First (Smith, Jane). This generator outputs both automatically when you select Chicago 17.

Which style should you use?

If your instructor or journal has not specified a style, a general rule of thumb: APA for sciences, social sciences, education, and psychology; MLA for literature, languages, film, and cultural studies; Chicago for history, philosophy, theology, and fine arts. When in doubt, ask your instructor β€” they often have a strong preference even when the syllabus does not specify one.