MLA vs APA
MLA and APA are the two most common citation styles in American college writing. MLA (Modern Language Association) is used mostly in the humanities. APA (American Psychological Association) is used mostly in psychology, education, and the social and health sciences. The differences look small until you miss one and a grader flags the whole reference list.
| Dimension | MLA | APA |
|---|---|---|
| Disciplines | English, literature, foreign languages, most humanities | Psychology, education, nursing, social sciences |
| Current edition | MLA 9th edition | APA 7th edition |
| In-text citation | Author and page number: (Smith 23) | Author and year: (Smith, 2020); page for quotes |
| Reference list title | Works Cited | References |
| Date emphasis | Year appears in the Works Cited, not in-text | Year appears in every in-text citation |
| Title case in references | Title case (most words capitalized) | Sentence case for article and book titles |
What is MLA?
MLA is the citation style maintained by the Modern Language Association. The current edition is MLA 9, published in 2021. MLA is built around the idea that scholarship in the humanities is a conversation across time — which is why the in-text citation emphasizes the author and the specific page rather than the year of publication. If you are quoting Shakespeare, the year a particular edition was printed is less relevant than where in the text the passage appears. MLA in-text citations look like (Smith 23). The corresponding entry goes in a Works Cited page at the end, alphabetized by author’s last name, with titles in title case. MLA 9 also introduced the ‘core elements’ model, in which every source is built from the same nine-part template (author, title, container, contributor, version, number, publisher, publication date, location), which makes citing podcasts, websites, and multimedia more consistent than it used to be.
What is APA?
APA is the citation style maintained by the American Psychological Association. The current edition is APA 7, published in 2019. APA is built for fields where recency matters: a 1995 psychology finding may have been superseded by 2024 research, so the year needs to be visible whenever a source is cited. That is why APA in-text citations include the year every time: (Smith, 2020). The corresponding list is called References, alphabetized by author. Article and book titles in the reference list use sentence case (only the first word and proper nouns capitalized), while journal names keep title case. APA 7 made several updates over APA 6 that matter in practice: the publisher location is no longer required for books, DOIs are formatted as URLs, and the running head is no longer required in student papers unless the instructor asks for it.
Key differences
The most common day-to-day difference is the in-text citation. MLA uses author and page — (Smith 23). APA uses author and year, and adds the page number only for direct quotations — (Smith, 2020) for a paraphrase, (Smith, 2020, p. 23) for a quote. The reference list differs in title (Works Cited vs References), in the capitalization of titles (title case vs sentence case for article and book titles), and in where the year lives (at the end of the entry in MLA, right after the author in APA). Formatting of long quotes, headings, and the title page also differs. If you are switching between the two, the single biggest source of lost points is mixing sentence case and title case in the reference list.
When to use which
Use MLA when you are writing for an English, literature, languages, philosophy, or other humanities course. Most high school English classes also default to MLA. If your instructor has not specified and you are writing a literary analysis or textual argument, MLA is the safe choice. Use APA when you are writing for psychology, education, nursing, communication, sociology, or another social or health science course. Most quantitative research papers and lab reports in those fields default to APA. Always check the assignment prompt or syllabus first — an instructor’s preference overrides general disciplinary convention. And if you are submitting to a journal, use whatever style that journal’s author guidelines specify, even if it is neither MLA nor APA.
Examples
MLA in-text: (Austen 112). Works Cited entry: Austen, Jane. Emma. Edited by George Justice, 4th ed., W. W. Norton, 2012. APA in-text: (Kahneman, 2011) for paraphrase; (Kahneman, 2011, p. 34) for a direct quote. References entry: Kahneman, D. (2011). Thinking, fast and slow. Farrar, Straus and Giroux. Notice the flip: MLA puts the year at the end and capitalizes most words in the book title; APA puts the year right after the author and uses sentence case for the book title. These small punctuation and capitalization choices are exactly where most student papers lose points. A practical note: if you are using a reference manager like Zotero or Mendeley, it will format both styles correctly, but only if your source records are clean. The manager cannot repair an entry that is missing the publication year or has the wrong capitalization in the imported title. Before you run an MLA-to-APA conversion (or back), open each entry and confirm the core fields are filled in the way the style expects. A ten-minute cleanup at the start saves an hour of hand-fixing at the end. And if you are submitting a paper that mixes styles — say, an APA-style social science paper quoting a literary text — the rule is to follow the main style and cite the anomaly inside it rather than switching systems midway through the document.
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