A dissertation cites the same review in its literature chapter and again in its discussion. A second-year student cites one textbook in three modules. Every piece of work needs a list of its own, but the sources behind them overlap. The way to organise references with tags by chapter or assignment is to keep every source once, in one master list, and let tags say where each is used, what it is about and how far you have got with it.
EdCitation publishes this guide. Pages from the libraries and graduate schools of eight universities were read for it on 24 September 2026, with the APA Style site, the ICMJE Recommendations and the IEEE reference guide, and EdCitation's free Verify references was run on a merged list. The short version: let Cite a source build every entry from the publisher's record, tag it the day it enters a draft, and before handing anything in, filter the list to that piece of work's tag and check what is left.
Should each chapter or assignment have its own reference list?
Each piece of work hands in its own list, but you should keep only one: a master list from which every chapter's or assignment's list is drawn. The University of Leeds (n.d.-a) recommends a single EndNote library rather than separate libraries for different assignments, projects or areas of research, with groups inside it for chapters, topics or essays. The University of York (2026) gives the principle behind that: in EndNote, Zotero and Paperpile alike, a reference can sit in several categories at once, and taking it out of one leaves it in the library.
Two lists holding the same source drift apart, because a correction made in one never reaches the other. One list has nothing to drift from.
What your university decides for a thesis
Whether the thesis carries one list at the end or one per chapter is set by your graduate school, and the rules differ.
| Rule set | What it says | What your tags have to do |
|---|---|---|
| University of Memphis | One list at the end holding every cited work; a list per chapter only when the chapters are articles submitted or accepted for publication | Produce one merged list; chapter tags are for drafting and checking |
| Vanderbilt University, multi-part or journal article format | Each chapter may carry its own list, or all go at the end, as the discipline's custom has it | Ask your department, then pull each chapter's list or the whole |
| University of Utah, published articles as chapters | References at the end of each chapter, and each set may follow the style of the chapter's journal | A list per chapter tag, each in its journal's style |
| Coursework in APA 7 | Each listed work is cited in the text, and each cited work is listed | A tag per assignment, and nothing under it the assignment does not cite |
| EdCitation, free account | References saved to your account; the list takes tags and filters by tag | Filter by the tag, then copy or download what is showing |
The rows come from the University of Memphis Graduate School (2025), the Vanderbilt University Graduate School (2025), the University of Utah Graduate School (2022) and the American Psychological Association (2022).
Drafting chapters in separate files
Murdoch University Library (2026) notes that theses are often written one section to a file, that EndNote's cite-while-you-write puts a list at the end of each, and that the finished thesis will usually need one merged list. The merge is where a source cited two ways becomes two entries.
How should I organise references with tags?
Use three kinds of tag, each answering one question: where the source is used, what it is about, and where it stands. Decide the names before you start, and add one only when no old tag fits.
| Kind of tag | Examples | The question it answers | Where it lives in EdCitation |
|---|---|---|---|
| Place | ch2, ch5, EDU210 essay 1 | Which list does this source belong in? | A tag on the reference; filter by it to get that list |
| Theme | retrieval practice, thematic analysis | What is it about, across chapters? | A tag on the reference |
| Status | to read, read, cited | How far have I got with it? | Unread sources wait in the reading list; the rest are tagged in your reference list |
Place tags, one for each chapter or assignment
Name each place tag so it cannot be misread later: "ch2" rather than "lit review", which stops meaning anything once the review is split across two chapters, and a module code with the assignment rather than "essay". The University of York (2026) offers "cite in chapter 2" as an example label. Let a place tag mean "cited here": add it when the citation goes into the draft, not when a source first looks useful, and remove it when you cut the citation. Filtering by the tag then gives exactly the list you hand in.
Theme tags, few and chosen by you
Harvard Library (2026) says Zotero tags are most often used for the topics an item covers, and strongly advises switching off automatic tagging, because keywords and subject headings imported from databases clutter the tag list. A theme tag earns its place when it gathers the same sources for two different chapters. A tag only one source carries is a note, not a theme.
Status tags: to read, read, cited
Harvard Library (2026) mentions tags that mark an item read or unread, the University of York (2026) lists "to read" among its example labels, and the University of Leeds (n.d.-b) suggests tags for deciding which papers from a search to review first. Three states are enough: to read, read but not yet cited, and cited. The first grows fastest after a good search; in EdCitation it is the reading list, where sources bookmarked from Find sources wait until you have read them.
Naming rules that keep the scheme usable
- One spelling. A tag list treats "ch2", "ch 2" and "chapter 2" as three tags. The University of Massachusetts Dartmouth Library (2026) explains how to merge a pair such as "teenagers" and "teenager" by renaming one; better never to create the pair.
- Kept after the work is marked. An old assignment's tag records where a source has been used, which is worth knowing when you cite it again next year.
How do I keep one master list without duplicate references?
Add each source once, built from its identifier, and when a new chapter or assignment cites it, give the entry another tag rather than adding it again. The University of York (2026) sets out what happens otherwise: cite two versions of one item at different points in a document and it appears more than once in the bibliography, and the versions may not carry the same details.
How a second version gets in
- Typed from memory. A source cited in chapter 2 in March is cited again in chapter 5 in October, with a half-remembered year and journal.
- Two editions of one book. Each edition has its own year, ISBN and page numbers, so they are different works. Choose the edition you read and use it in every chapter, page numbers included.
- Pasted from another list. An entry copied from an old essay brings that essay's style and slips with it.
What a check of a merged list found
On 24 September 2026 we pasted three entries into EdCitation's Verify references, as a list merged from two dissertation chapters might hold them: Braun and Clarke's 2006 paper on thematic analysis, the 2013 review of learning techniques by Dunlosky and colleagues as built from its DOI for chapter 2, and the same review as typed for chapter 5, with the year as 2012 and the journal as Psychological Science:
Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2012). Improving students' learning with effective learning techniques. Psychological Science, 14(1), 4–58.
The first two came back verified, each noting that the DOI resolves to its record and the title matches. The third came back doubtful, shown as "check this", with the reason: "This is the same work as entry 2. A reference list gives each work once." A second run gave Braun and Clarke's paper twice, in APA 7 and in Harvard, and the Harvard copy got the same verdict. Either way, delete the second entry and correct every citation that pointed to it.
How do I avoid citing one source differently in two places?
Make every citation of a source point to its one entry, and match it. The American Psychological Association (2022) asks that the spelling of author names and the dates in the text match the reference list entry. Two things break that when chapters or assignments come together.
Letters for works by one author in one year
When two works share an author and a year, APA 7 adds a lowercase letter after the year, assigned by the order of their titles in the reference list, and the letter goes in the citation as well as the entry; the American Psychological Association (2020) gives Blondaux and O'Hanrahan 2018a and 2018b as its example. A chapter that cites only one of the two needs no letter. The thesis that cites both does, so a citation that was right in the chapter 2 draft needs a letter once chapter 4 brings in the second work. Before merging, look through the master list for any author with two works in one year, and fix the letters in every chapter at one sitting.
Numbers in IEEE and Vancouver
In the numbered styles a number belongs to the source, not to the place it is cited. The International Committee of Medical Journal Editors (2026) numbers references consecutively in the order they are first mentioned in the text, and IEEE (2025) tells authors to cite the earlier reference number when a source comes back, instead of writing "ibid.". In a thesis with one list, a source first cited in chapter 2 as [7] is [7] again in chapter 5; where each chapter has its own list, as in Utah's article format, each chapter is numbered as the article it is. A list kept apart from the document cannot know the order in which you cite, so put a numbered list in order of first citation once the chapter is final. The other mismatches a merge turns up are in in-text citations that do not match the reference list.
How do I pull out one chapter's or assignment's reference list?
Filter the master list by the place tag, check it against the draft, set the style, and copy it in:
- Tag as you cite. The place tag goes on when the citation enters the draft.
- Filter by the tag. The list now shows that chapter or assignment alone.
- Match it to the draft. Every citation in the text needs an entry under the tag, and every entry under the tag needs a citation. With the whole paper uploaded, Verify references matches every in-text citation to the list and every entry back to the text.
- Set the style. One style for the list, from the brief or the journal. In EdCitation a single reference can take a style of its own when it has to differ.
- Copy or download. In EdCitation, the filtered list pastes into your document with its italics intact, or saves as a Word file, a BibTeX file for LaTeX, or an RIS file for another reference manager.
- Order a numbered list by first citation, if the style is IEEE or Vancouver.
- Check the finished list in Verify references. Every entry is marked verified, doubtful ("check this") or not found, a retracted paper is flagged, and an entry the indexes could not reach says so, never "not found".
For a thesis with one list, run steps 2 and 3 for each chapter as it is finished, then take the whole list, unfiltered, for the end.
How does EdCitation keep a tagged master list?
EdCitation is the best place for a master list that several chapters or assignments draw on, because every entry is looked up in the publisher's record and never written, so the entry chapter 5 uses is the entry chapter 2 used, and the check at the end reads the merged list as a whole. In the run above, the Dunlosky review typed from memory came back as "check this", named as a second copy of a work already listed.
With a free account, your references and your reading list are saved to your account: whichever device you sign in on, and whichever course you are on, the master list is the same one. You label any reference with tags of your own and narrow the list to one of them; an entry that must differ from the rest can carry its own style; and the list pastes with its italics or saves as Word, BibTeX or RIS. Cite a source makes each entry in any of six styles (APA 7, MLA 9, Chicago 18 author-date, Harvard, IEEE, Vancouver) from a DOI, PubMed ID, ISBN, title or web address, and screens the work for retraction. Find sources, Cite a source and Verify references cost nothing and need no account.
For a chapter as a file, References from a file checks every reference in the upload and matches each in-text citation to the list. A free account gets three of those checks a month; Pro ($8 a month) lifts the limit. An uploaded paper stays in the browser used for the check, so keep your own copy. Max ($24 a month) adds Theoretics QA and the Library; the plans are on Pricing.
EdCitation never writes any part of your paper, and has no plug-in that inserts citations into Word as you type: the list is pasted in. For that job, EdCitation vs Zotero and ZoteroBib compares the two; keeping your references from course to course covers where a list should live across a degree; and keeping hundreds of sources straight takes a thesis's list further.
Quick questions
How many tags should one reference have?
Usually three or four: a chapter or assignment, one or two themes, and a status. A source cited in two assignments carries both place tags.
Can one source appear in two chapters' reference lists?
Yes, where each chapter has its own list, as in a thesis made of articles. In a thesis with one list at the end, it appears once, and every chapter cites that entry.
Should I keep a separate reference list for each module?
No. Keep one master list with a tag for each module and assignment, as the University of Leeds recommends for EndNote, and filter by the tag when a piece of work needs its list.
Can I tag references by chapter in EdCitation?
Yes, with a free account. Give a reference tags like "ch2" or "essay 1", narrow the list to one tag, and paste or download what remains; Cite a source builds each entry from the publisher's record.
What should I do with a source I have not read yet?
Tag it "to read", or keep it out of the reference list. In EdCitation it waits in the reading list, and goes into the reference list with its chapter tag when you cite it.
References
- American Psychological Association. (2020). Citing works with the same author and date. APA Style. https://apastyle.apa.org/style-grammar-guidelines/citations/basic-principles/same-year-author
- American Psychological Association. (2022, July). Basic principles of citation. APA Style. https://apastyle.apa.org/style-grammar-guidelines/citations/basic-principles
- Braun, V., & Clarke, V. (2006). Using thematic analysis in psychology. Qualitative Research in Psychology, 3(2), 77–101. https://doi.org/10.1191/1478088706qp063oa
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques: Promising directions from cognitive and educational psychology. Psychological Science in the Public Interest, 14(1), 4–58. https://doi.org/10.1177/1529100612453266
- Harvard Library. (2026, September 23). Organize your Zotero library. Zotero research guide. https://guides.library.harvard.edu/c.php?g=1245347&p=9129454
- IEEE. (2025). IEEE reference guide (Version 3.28.2025). IEEE Author Center. https://journals.ieeeauthorcenter.ieee.org/wp-content/uploads/sites/7/IEEE_Reference_Guide.pdf
- International Committee of Medical Journal Editors. (2026). Preparing a manuscript for submission to a medical journal. ICMJE Recommendations. https://www.icmje.org/recommendations/browse/manuscript-preparation/preparing-for-submission.html
- Murdoch University Library. (2026, August 6). Manage theses & large documents. EndNote 2025 guide. https://libguides.murdoch.edu.au/endnote/insert-references/theses
- University of Leeds. (n.d.-a). Create groups. Organise with groups and tags. Library. Retrieved 24 September 2026, from https://library.leeds.ac.uk/info/1403/endnote/226/organise-with-groups-and-tags
- University of Leeds. (n.d.-b). Use tags to organise your library. Organise with groups and tags. Library. Retrieved 24 September 2026, from https://library.leeds.ac.uk/info/1403/endnote/226/organise-with-groups-and-tags/5
- University of Massachusetts Dartmouth Library. (2026, June 3). Organize & find references. Citation management with Zotero. https://guides.lib.umassd.edu/c.php?g=947780&p=6833890
- University of Memphis Graduate School. (2025, October). Thesis/dissertation guide. https://www.memphis.edu/gradschool/current_students/td-prep.php
- University of Utah Graduate School. (2022, August 24). Published articles as dissertation chapters. Thesis handbook. https://gradschool.utah.edu/thesis/handbook/published-articles-as-dissertation-chapters.php
- University of York. (2026, September 2). Organise. Reference management: A practical guide. University of York Library. https://subjectguides.york.ac.uk/reference-management/organise
- Vanderbilt University Graduate School. (2025, February 24). Thesis & dissertation guidelines. https://gradschool.vanderbilt.edu/academics/thesis-dissertation-guidelines/