Thesis Formatting Guide: APA, MLA, Chicago, and Harvard Styles

Introduction

Formatting is the part of thesis writing that scholars most underestimate and examiners most relentlessly enforce. You can spend two years producing brilliant research and lose marks for inconsistent italics, misaligned margins, or a single misformatted reference. Most universities specify a citation style in the handbook, and most handbooks are unforgiving: failure to comply can delay your submission by a full semester while you reformat 80,000 words by hand.

The challenge is that the four major styles — APA, MLA, Chicago, and Harvard — differ in dozens of small but consequential ways. APA italicises journal volume numbers but not issue numbers; MLA italicises both; Chicago notes put authors in normal font; Harvard uses brackets for the date and italicises book titles. Get these wrong consistently and your reference list looks amateurish. Get them right and your thesis reads like published scholarship.

This guide compares the four styles side by side, walks through their citation logic, and gives you a formatting checklist that works for any thesis. We will reference the current editions (APA 7th, MLA 9th, Chicago 17th, Harvard as commonly implemented). For hands-on help, our professional editing service handles formatting as part of the final polish.

Choosing the Right Style for Your Discipline

Citation styles are not arbitrary; each was developed for a specific disciplinary community and reflects its priorities. APA, published by the American Psychological Association, dominates psychology, education, business, nursing, and the social sciences. Its emphasis on date of publication reflects the field’s focus on recency of evidence. MLA, from the Modern Language Association, dominates literature, language, and humanities; its emphasis on author and page number reflects close-reading practices. Chicago, from the a top US university Press, dominates history, theology, and the arts; its notes-and-bibliography system allows rich discursive footnotes. Harvard, despite its name, was not invented at Harvard; it dominates UK and Commonwealth social science, business, and engineering and is favoured for its compact in-text format.

Confirm your style in your programme handbook before you start writing. Do not assume it from your discipline — many UK universities use Harvard even in psychology, and some US history programmes use APA. If your handbook is silent, ask your supervisor. Once you have chosen, commit fully: mixing styles is the single most common formatting error and examiners notice immediately. For help positioning your thesis within disciplinary conventions, see our literature review guide and research methodology guide.

“The citation style you choose is not just a formatting rule. It is a signal of which scholarly community you belong to. Get the style wrong and examiners read you as an outsider before they reach your argument.”

APA Style (7th Edition)

APA style uses an author-date in-text citation system: (Smith, 2022). Page numbers are added for direct quotes and specific paraphrases: (Smith, 2022, p. 47). The reference list at the end is alphabetised by author surname. The 7th edition, released in 2020, introduced several changes from the 6th edition — notably, the location of the publisher is no longer required in book references, and DOIs are formatted as URLs.

Key APA 7th formatting rules:

• In-text citation: (Author, Year) or (Author, Year, p. X) for quotes.
• Book reference: Smith, J. (2022). Title of book in sentence case and italics. Publisher.
• Journal article: Smith, J., & Jones, K. (2022). Title of article in sentence case. Journal Name in Title Case and Italics, volume in italics(issue in regular font), page range. https://doi.org/xxxxx
• Headings: Five levels, from centred bold Level 1 to indented italic Level 5.
• Numbers: Spell out numbers below 10; use numerals for 10 and above.
• Tables and figures: Numbered sequentially (Table 1, Figure 1); title in italic title case above the table; notes below in smaller font.

APA is the standard for psychology, education, business, and most quantitative social science. If your thesis reports statistics, APA’s reporting conventions for test statistics (italicised letters, exact p-values, effect sizes) apply regardless of your broader style choice. See our data analysis chapter guide for the full reporting conventions.

MLA Style (9th Edition)

MLA style uses a parenthetical author-page system: (Smith 47). The date is omitted from in-text citations because in literary studies, the work’s original publication date is often more meaningful than the edition’s. MLA relies on a Works Cited list at the end, formatted with a hanging indent. The 9th edition, released in 2021, updated guidance on citing digital sources, social media, and multimedia.

Key MLA 9th formatting rules:

• In-text citation: (Author Page) without a comma, e.g., (Smith 47).
• Book: Smith, John. Title of Book in Title Case and Italics. Publisher, Year.
• Journal article: Smith, John. “Title of Article in Title Case and Quotation Marks.” Journal Name in Title Case and Italics, vol. 12, no. 3, 2022, pp. 45–67.
• Container concept: The 8th/9th edition core elements system (Author, Title, Container, Contributors, Version, Number, Publisher, Date, Location) handles complex digital sources.
• Headings: Less prescriptive than APA; MLA leaves heading style to author preference but recommends consistency.
• Numbers: Spell out numbers that can be written in one or two words; use numerals for the rest.

MLA is the standard for English literature, modern languages, comparative literature, and media studies. It handles primary texts (novels, poems, films) and secondary criticism elegantly, which is why humanities scholars prefer it. For writing-style guidance that complements MLA, see our academic writing style guide.

Chicago Style (17th Edition)

Chicago is distinctive because it offers two systems: Notes and Bibliography (N&B), favoured in humanities, and Author-Date, favoured in social sciences. Confirm which your programme requires before you start. The 17th edition, released in 2017, updated guidance on digital sources and shortened citations.

Key Chicago N&B formatting rules:

• Footnote (first citation): John Smith, Title of Book (Place: Publisher, Year), 47.
• Footnote (subsequent): Smith, Title of Book, 52. Or simply Smith, 52.
• Bibliography: Smith, John. Title of Book. Place: Publisher, Year.
• Journal article (footnote): John Smith, “Article Title,” Journal Name 12, no. 3 (2022): 47.
• Discursive footnotes: Chicago encourages substantive footnotes that add context, debate, or detail without cluttering the main text. This is its signature feature.

Chicago Author-Date resembles APA in structure (Smith 2022, 47) but with subtle differences in punctuation and italicisation. History, theology, philosophy, and the arts favour N&B; anthropology and some social sciences use Author-Date. The choice is consequential: N&B produces many footnotes, which can distract in some word-count-limited formats.

Harvard Style

Harvard is unusual among the major styles because it has no single authoritative publisher. Harvard originated in the late 19th century at a top US university and was formalised by Edward Laurens Mark in 1881, but it has been adapted by dozens of universities and publishers, producing minor variations. Always check your institution’s specific Harvard guide; do not assume a generic Harvard template will pass.

Common Harvard formatting rules (most variants):

• In-text citation: (Author, Year) or (Author, Year, p. 47).
• Book: Smith, J. (2022) Title of book in sentence or title case. Place: Publisher.
• Journal article: Smith, J. and Jones, K. (2022) ‘Title of article in single quotation marks’, Journal Name in Italics, 12(3), pp. 45–67.
• Use of single quotation marks for article titles is the most distinctive Harvard tell.
• Page ranges: Often use ‘pp.’ prefix in reference list.

Harvard dominates UK and Commonwealth university theses in business, engineering, and applied sciences. Its compact in-text format keeps prose clean. The lack of an authoritative source means you must follow your university’s style guide exactly — variations in punctuation, capitalisation, and order of elements are common.

General Thesis Formatting Beyond Citation Style

Whatever your citation style, your thesis must also comply with your university’s general formatting rules. These are usually non-negotiable and can delay submission if violated:

• Font: Times New Roman 12pt or Arial 11pt are the most common defaults. Some universities accept Calibri, Garamond, or Computer Modern (LaTeX).
• Line spacing: 1.5 or double spacing throughout, including references and block quotes.
• Margins: Typically 2.54 cm (1 inch) all round, sometimes wider on the binding edge (3–3.5 cm).
• Page numbers: Roman numerals (i, ii, iii) for front matter; Arabic numerals (1, 2, 3) from the introduction onwards.
• Headings: Consistent hierarchy with numbered sections (1, 1.1, 1.1.1) in most STEM and social science disciplines.
• Tables and figures: Numbered sequentially within chapters (Table 1.1, 1.2, 2.1); caption above tables, below figures.
• Block quotes: Indented and single-spaced for quotes over 40 words (APA), over 4 lines (MLA), or over 100 words (Chicago).
• Title page: Specific institutional template with title, author, supervisor, programme, institution, and date.

Build a Word or LaTeX template that embeds these rules before you start writing. Changing formatting on a 60,000-word thesis manually takes days; doing it through styles takes minutes. For LaTeX users, university templates are usually available from the graduate office. For Word users, set up Heading 1, Heading 2, Heading 3, Normal, Block Quote, Caption, and Reference List styles in your document template.

Citation Management Tools That Save Weeks

Manual reference management is a mistake at any thesis length above 5,000 words. Use a citation manager from day one. The three leading options each have strengths:

• Zotero: Free and open-source; excellent browser extension for capturing sources; strong for humanities and Chicago N&B.
• Mendeley: Free with Elsevier account; strong PDF annotation; popular in STEM.
• EndNote: Paid (often site-licensed by universities); powerful for very large libraries (1,000+ references); popular in medicine and life sciences.

Whichever you choose, learn to use its Word or LibreOffice plugin to insert citations as you write. The plugin builds your reference list automatically and reformats it in seconds if you switch styles. For deeper coverage of citation practice and avoiding plagiarism, see our academic citation guide and our guide to avoiding plagiarism.

A Pre-Submission Formatting Checklist

Run your thesis against this checklist in the final week before submission:

1. All citations in text have a matching entry in the reference list, and vice versa.
2. Reference list is alphabetised by first author surname.
3. Reference list uses a hanging indent and consistent punctuation per the style guide.
4. In-text citations follow the style’s exact punctuation (commas, brackets, page format).
5. Direct quotes over the threshold length are formatted as block quotes.
6. Headings follow a consistent hierarchy and match the table of contents exactly.
7. Tables and figures are numbered sequentially and captioned correctly.
8. Page numbers alternate Roman to Arabic at the correct point.
9. Margins, font, and line spacing match the institutional template.
10. Title page matches the required template exactly.
11. PDF was tested on a second computer and renders correctly.

If any item fails, fix it before your supervisor sees the final draft. Formatting errors are the cheapest mistakes to fix and the easiest to lose marks for. Our professional editing service can run this checklist for you in 48 hours. For the broader editing workflow, see our guide on editing and proofreading your thesis.

Conclusion

Thesis formatting is not busywork. It is the final layer of professionalism that signals you belong in your scholarly community. Choose your citation style deliberately based on your discipline and programme handbook. Master the specific rules of that style — the punctuation, italicisation, and ordering that distinguish APA from MLA from Chicago from Harvard. Build a document template that embeds your institution’s general formatting rules before you write. Use a citation manager from day one. Run the pre-submission checklist in the final week and fix every issue before your supervisor sees the draft.

A thesis that is brilliantly argued but inconsistently formatted reads as amateur. A thesis that is competently argued and impeccably formatted reads as professional. The difference can be a grade boundary. If you would like help with the final formatting polish, contact WriteBing, browse our academic services, or check our pricing. For the rest of the thesis workflow, see our guides on how to write a thesis, academic citations, and editing and proofreading.

Frequently Asked Questions