Citation styles exist to give credit to sources and help readers find them. Every academic discipline has adopted one as a standard, and submitting your essay in the wrong format can cost marks even if your content is excellent. Here is a clear breakdown of the major styles and when to use each.
APA (American Psychological Association)
APA is the default style for psychology, education, social sciences, nursing, and business. It emphasises the date of publication because recency matters in these fields — research from ten years ago may be outdated. In-text citations use author–date format: (Smith, 2022). The reference list is alphabetical by author surname. APA 7th edition (the current version) introduced changes to how DOIs are formatted and how group authors are cited.
Example reference: Smith, J. A. (2022). Cognitive development in early childhood. Oxford University Press.
MLA (Modern Language Association)
MLA is standard for literature, languages, film studies, cultural studies, and the humanities. It emphasises the author because in literary analysis you return to the same source repeatedly. In-text citations use author–page format: (Smith 47). The works-cited list uses a flexible "container" system introduced in MLA 9th edition that handles everything from journal articles to tweets.
Example: Smith, John. Reading the Victorian Novel. Cambridge UP, 2021.
Chicago / Turabian
Chicago is used in history, arts, and some social sciences. It has two systems: Notes-Bibliography (used in humanities — footnotes with a bibliography) and Author-Date (used in social sciences — similar to APA). Turabian is a simplified version of Chicago designed for student papers. Chicago is the most flexible style and handles unusual sources like manuscripts, archives, and legal documents better than APA or MLA.
Harvard
Harvard is not a single official style — it is a family of author–date styles used widely in UK, Australian, and South African universities. Each institution has its own version (Cite Them Right Harvard is most common). If your university says "use Harvard", always check their specific version. It looks similar to APA but has different formatting for publishers and page ranges.
Vancouver and IEEE
Vancouver is the standard for medicine and health sciences. Sources are numbered in the order they appear in the text: [1], [2], [3]. IEEE (Institute of Electrical and Electronics Engineers) works the same way and is used for engineering, computing, and technology papers. Both styles make the text clean and uncluttered, which is why technical and scientific fields prefer them over author–name styles.
Quick Decision Guide
- Psychology, education, social science, nursing → APA 7
- English literature, languages, film, cultural studies → MLA 9
- History, philosophy, religious studies → Chicago 17
- UK or Australian university (check their guide) → Harvard
- Medicine, health, pharmacology → Vancouver
- Engineering, computing, electronics → IEEE
Common Mistakes Across All Styles
Regardless of style, these are the most common errors: (1) missing the access date for online sources; (2) inconsistent capitalisation in titles — APA uses sentence case for article titles, MLA uses title case; (3) confusing the DOI format — APA 7 requires https://doi.org/ not just the number; (4) forgetting page numbers in direct quotes; (5) listing sources in the wrong order — APA and MLA are alphabetical, Vancouver and IEEE are sequential.
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