APA and MLA solve the same problem — showing where your information came from — with two genuinely different systems. Mixing them up is an easy mistake because the two formats are close enough to half-remember and different enough to be wrong in the details. Here's exactly where they diverge, and how to tell which one your assignment actually wants.
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APA cites the author's last name, the publication year, and — for direct quotes — a page number, separated by commas: (Taylor, 2018, p. 23). MLA drops the year entirely and just uses the author's last name and a page number with nothing between them but a space, no comma and no "p.": (Taylor 23). If you've ever seen a paper with a comma and a "p." that shouldn't be there, or missing a year that should be, that's almost always a citation style getting crossed with the wrong one.
The author-count rules are similar in spirit but styled differently too. For two authors, APA uses an ampersand — (Harris & Cook, 2020) — while MLA spells out "and": (Harris and Cook 48). Both styles shorten three-or-more-author sources to the first author plus "et al." from the very first citation.
APA's source list is titled "References"; MLA's is titled "Works Cited" — and that's just the start. APA uses sentence case for titles, capitalizing only the first word, the first word after a colon, and proper nouns: Climate change and coastal cities. MLA uses title case, capitalizing most major words: Climate Change and Coastal Cities. APA puts the publication date in parentheses right after the author's name; MLA places it later in the citation with no parentheses. And for articles or chapters, APA applies no special formatting to the title, while MLA wraps it in quotation marks — in both styles, book and journal titles are italicized.
Author names differ too: APA lists initials — Mounier-Kuhn, P. — while MLA spells out the full first name — Mounier-Kuhn, Pierre. Even the page-level formatting splits: APA papers get a separate title page and a running head; MLA skips the title page in favor of a four-line header (your name, instructor, course, date) on page one, with just your last name and the page number repeating as the header on every page after.
As a general rule, APA is the standard in the social sciences, behavioral sciences, education, and business; MLA is the standard in the humanities — literature, languages, and media studies. That's a useful default, not a guarantee: some departments and individual instructors specify a style that doesn't match the general pattern for their field, and that instruction always overrides the general rule. Check your assignment sheet or syllabus before assuming.
Whichever one you land on, don't mix the two within a single paper — pick one style and apply it consistently for every citation and the reference list itself. StudyPilot's citation generator formats both APA and MLA (along with Chicago, Harvard, IEEE, and Vancouver), so switching between them for different classes doesn't mean re-learning the comma-and-"p." rules from scratch each time.
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