IEEE Citation Style Guide 2026: Numbered References for Engineering & CS Theses

Your supervisor has just marked your thesis draft in red: “Reference formatting does not conform to IEEE.” If you study electrical engineering, computer science, or any related technical discipline, you know that moment well. The IEEE citation style guide — built on sequential numbered references rather than author-date pairs — underpins almost every technical paper published through the Institute of Electrical and Electronics Engineers. IEEE journals, conference proceedings, and most engineering departments will reject submissions with formatting errors, and examiners spot them immediately.

This guide covers everything you need to format references correctly in 2026: how in-text numbered citations work, how to build the reference list, exact format templates for every source type (journal articles, conference papers, books, book chapters, IEEE standards, technical reports, theses, datasets, and websites), IEEE abbreviation conventions, handling multiple citations, and the eight mistakes that trip up most students. Every section includes copy-paste examples drawn from the official IEEE Reference Guide published by the IEEE Author Center.

What is IEEE citation style?

IEEE citation style is a reference format developed and maintained by the Institute of Electrical and Electronics Engineers, the world’s largest technical professional organisation. It is the required style for papers submitted to all IEEE journals, transactions, and conference proceedings, and it is widely mandated by engineering, computer science, and technology departments at universities across the US, UK, Australia, Canada, and beyond.

The style is built on a simple principle: every source cited in the body is assigned a sequential number the first time it appears. That number travels with the source for the rest of the document. Readers who want full bibliographic details look up the corresponding entry in the numbered reference list at the end. This approach keeps body text uncluttered — no parenthetical author names and dates — which is why it suits technical papers packed with equations and data.

The authoritative rule source is the IEEE Reference Guide, published by the IEEE Author Center. For style questions beyond references — figures, equations, units, abbreviations — the IEEE Editorial Style Manual is the governing document.

When is IEEE citation style required?

• IEEE journals and transactions — IEEE Transactions on Neural Networks and Learning Systems, IEEE Access, Proceedings of the IEEE, and all other IEEE periodicals mandate this format without exception.
• IEEE conference proceedings — CVPR, ICASSP, ICCV, INFOCOM, and hundreds of conferences that operate under IEEE sponsorship or use IEEE templates.
• Engineering and CS theses and dissertations — Many departments mandate IEEE because it is the format students will use when submitting their research to journals or conferences after graduation.
• Technical reports and standards documents — Organisations in electrical engineering, computer engineering, IT, and telecommunications frequently adopt IEEE format for internal and external documentation.

If your supervisor or department style guide says “IEEE format,” “IEEE referencing,” or “IEEE citation,” this guide covers every rule you need.

In-text citations: how numbered references work

The IEEE citation style guide’s defining feature is the bracketed number. Every time you draw on a source, you insert its assigned reference number in square brackets. The first source cited anywhere in the paper is [1], the second new source encountered is [2], and so on through the document. No author name, no year — just the number.

Basic placement rules

• Position: The number follows the material it supports, placed before any punctuation (comma, full stop, semicolon, colon).
• Space before bracket: Leave one space between the preceding word and the opening bracket: …as demonstrated in [3]. not …as demonstrated in[3].
• Repeating a source: Use the same number every time. If [4] is first cited on page 2 and again on page 9, it remains [4] both times — no new number is assigned.

Citing with and without author names

IEEE generally discourages naming authors in the body text; the number alone is sufficient. When authorship is integral to the argument, name the first author only — do not include the publication year:

• Preferred: “Recent experiments demonstrated consistent improvements [4].”
• Acceptable when authorship matters: “Smith [4] demonstrated consistent improvements.”
• Not accepted: “Smith et al. (2023) [4] demonstrated…” — the year does not belong in the body text.

Page-specific and section-specific citations

When quoting directly or pointing readers to a specific location in a source, add the locator inside the bracket:

• Single page: [4, p. 23]
• Page range: [4, pp. 23–27]
• Chapter or section: [4, Ch. 3] or [4, Sec. 5.2]
• Table or equation: [4, Tab. II] or [4, eq. (7)]

Reference list rules

The reference list appears at the end of the document under the heading References (centered or flush left, not bold unless a house style requires it). Every source cited in the body must appear here; sources you have read but not cited are excluded.

Ordering

References are listed in order of first appearance in the text, not alphabetically. [1] is the first source cited, [2] is the second, and so on. This is one of the most common errors made by students switching from APA, Harvard, or Chicago, where alphabetical ordering is standard practice.

Author name format

• Use initials before the surname: A. B. Smith. Not the APA or Harvard format of Smith, A. B.
• List all authors when there are six or fewer.
• For seven or more authors, list the first author then “et al.” — no comma before “et al.,” not italicised: E. P. Wigner et al.
• Separate multiple authors with commas; precede the final author with “and”: A. B. Smith, C. D. Jones, and E. F. Lee.

Title formatting

• Article, paper, and chapter titles: enclosed in double quotation marks, sentence case — capitalise only the first word and proper nouns.
• Journal, book, and conference names: in italics, using standard IEEE abbreviations where they exist (see Section 5).
• Standard names: in italics.

Layout and spacing

Each entry uses a hanging indent: the bracketed reference number is flush with the left margin, and subsequent lines of the same entry are indented. Single-space within each entry; double-space between entries (individual publishers may override this).

Format by source type (with copy-paste examples)

Journal article (print)

Template:

[#] A. B. Author and C. D. Author, "Title of article," Abbrev. J. Title, vol. X, no. Y, pp. xxx–xxx, Mon. Year.

Example:

[1] G. Liu, K. Y. Lee, and H. F. Jordan, "TDM and TWDM de Bruijn networks and their fault-tolerance capabilities," IEEE Trans. Comput., vol. 46, no. 6, pp. 695–701, June 1997.

Both volume and issue numbers are included when available. Month abbreviations follow IEEE conventions: Jan., Feb., Mar., Apr., Aug., Sept., Oct., Nov., Dec. — but May, June, and July are never abbreviated.

Online journal article (with DOI)

[2] R. E. Kalman, "A new approach to linear filtering and prediction problems," ASME J. Basic Eng., vol. 82, pp. 35–45, 1960, doi: 10.1115/1.3662552.

The DOI is appended at the end, prefixed with doi: in lowercase. No URL is needed when a DOI is present. The format doi: 10.xxxx/... is preferred over a full resolver URL.

Conference paper

Template:

[#] A. B. Author, "Title of paper," in Proc. Abbrev. Conf. Name, City, Country, Year, pp. xxx–xxx.

Example:

[3] C. H. Bennett and G. Brassard, "Quantum cryptography: public key distribution and coin tossing," in Proc. IEEE Int. Conf. Comput. Syst. Signal Process., Bangalore, India, 1984, pp. 175–179.

“Proceedings” is abbreviated to “Proc.” Conference location and volume number are optional but add clarity for less well-known venues.

Book

Template:

[#] A. B. Author, Book Title, Xth ed. City, State/Country: Publisher, Year.

Example:

[4] S. Haykin, Neural Networks: A Comprehensive Foundation, 2nd ed. Upper Saddle River, NJ, USA: Prentice Hall, 1999.

Edition is noted only from the second edition onward. For well-known cities (New York, London, Tokyo, Paris), state or country qualifiers are not required. For lesser-known cities in the US, add the two-letter state abbreviation; for international cities, add the country.

Book chapter (in an edited volume)

Template:

[#] A. B. Author, "Chapter title," in Book Title, A. B. Editor, Ed. City: Publisher, Year, pp. xxx–xxx.

Example:

[5] M. Vidyasagar, "Input-output stability," in Nonlinear Systems Analysis, 2nd ed. Englewood Cliffs, NJ, USA: Prentice-Hall, 1993, pp. 175–207.

IEEE standard

Template:

[#] Full Standard Name, IEEE Standard XXXX[-SubSec], Year.

Examples:

[6] IEEE Standard for Floating-Point Arithmetic, IEEE Standard 754-2019, 2019.

[7] IEEE Standard for Local and Metropolitan Area Networks—Bridges and Bridged Networks, IEEE Standard 802.1Q-2022, 2022.

The standard name is italicised; the standard number and publication year are not. Include the revision year as part of the standard number when it is part of the official designation.

Technical report

Template:

[#] A. B. Author, "Report title," Org. Name, City, State, Tech. Rep. No., Month Year.

Example:

[8] E. E. Reber, R. L. Michell, and C. J. Carter, "Oxygen absorption in the Earth's atmosphere," Aerospace Corp., Los Angeles, CA, USA, Tech. Rep. TR-0200 (4230-46)-3, Nov. 1988.

Thesis or dissertation

Template:

[#] A. B. Author, "Title of thesis," Ph.D. dissertation [or M.S. thesis], Dept. Name Abbrev., Univ. Name, City, Year.

Examples:

[9] J. O. Williams, "Narrow-band analyzer," Ph.D. dissertation, Dept. Elect. Comput. Eng., Harvard Univ., Cambridge, MA, USA, 1993.

[10] A. Agah, "Medical image analysis using artificial neural networks," M.S. thesis, Dept. Comput. Sci., Univ. of Kansas, Lawrence, KS, USA, 1995.

Use “Ph.D. dissertation” for doctoral work and “M.S. thesis” for master’s degrees (or “M.Eng. thesis” where appropriate). Department names are abbreviated. University name follows the thesis label directly after the comma.

Website or webpage

Template:

[#] A. B. Author (if available), "Page title," Site Name, Month Day, Year. [Online]. Available: URL. [Accessed: Mon. Day, Year].

Example:

[11] R. Turner, "Introduction to convolutional neural networks," AI Resource Center, Jan. 14, 2023. [Online]. Available: https://www.airesource.org/cnn-intro. [Accessed: Mar. 5, 2026].

The “[Accessed: …]” field is mandatory for websites because content can change or disappear. If no author is listed, begin with the page title. See also the guide to citing websites in APA 7 format if your other work uses APA rather than IEEE.

Dataset

Template:

[#] A. B. Author, "Dataset title," Repository Name, Year. [Online]. Available: DOI or URL. [Accessed: Mon. Day, Year].

Example:

[12] J. Deng et al., "ImageNet: a large-scale hierarchical image database," ImageNet, 2009. [Online]. Available: https://www.image-net.org. [Accessed: Feb. 20, 2026].

IEEE journal abbreviations

One of IEEE citation style’s distinguishing features is that journal titles are abbreviated according to a standardised list rather than written in full. Writing IEEE Transactions on Neural Networks and Learning Systems instead of IEEE Trans. Neural Netw. Learn. Syst. is a formatting error in submissions and thesis manuscripts that specify IEEE format.

The official list of IEEE journal title abbreviations is maintained on the IEEE Author Center website. The most common abbreviations for engineering and CS work:

For non-IEEE journals (Elsevier, Springer, ACM, Nature, etc.), there is no IEEE-maintained abbreviation list. Use a widely recognised abbreviated title if one exists (for example, the MEDLINE/PubMed abbreviation for medical journals), or spell the journal name out in full.

Multiple citations and special cases

Citing multiple sources at one point

When several references support the same claim simultaneously, list all their numbers in one combined bracket:

• Non-consecutive numbers: [1], [4], [7]
• Consecutive range (en dash): [6]–[9]
• Mixed: [1], [3], [6]–[8]

Do not expand a range if any number within it is missing from the reference list — list the individual numbers instead.

Repeating citations — no ibid.

IEEE does not use “ibid.” or “op. cit.” — conventions borrowed from humanities and legal writing. When the same source is cited again, simply repeat its original number. Source [3] cited for the twelfth time on page 18 is still [3], never “ibid.” or a new entry.

Secondary sources

IEEE prohibits citing secondary sources. If you have not read a paper directly — you are citing it only because another paper described it — you cannot include it as a reference. There is no IEEE equivalent of the APA “as cited in” construction. If the original paper is inaccessible, do not cite it.

Personal communications and unpublished data

Data from private correspondence, interviews, or unpublished manuscripts are acknowledged in the body text rather than as numbered references: “J. Smith, personal communication, Mar. 2025.” These do not appear in the reference list.

Common mistakes to avoid

If you need to migrate a completed thesis from IEEE to another format — or convert an APA or Harvard bibliography into IEEE order — the guide on how to reformat a whole thesis to a new citation style quickly covers the fastest approach, including bulk conversion via reference managers.

Tools that generate IEEE references automatically

Formatting references by hand across a 200-page thesis is error-prone. These tools support IEEE output and eliminate most manual work.

Reference managers

Zotero, Mendeley, and EndNote all include IEEE citation styles in their style libraries. Once a source is imported (via DOI, ISBN, or PDF metadata), you can generate a formatted reference and insert it into your Word or LaTeX document automatically. A detailed feature comparison is in the reference management tools guide for 2026.

Academic writing assistants with citation checking

Tools designed for academic manuscripts — Paperpal, Trinka, and Writefull — can flag citation formatting inconsistencies alongside grammar and phrasing suggestions. A direct comparison of their features is available in the Paperpal vs Trinka vs Writefull comparison guide.

LaTeX and BibTeX

Most IEEE conference and journal templates are distributed as LaTeX packages. The IEEEtran.bst BibTeX style file handles reference formatting automatically when used with the official IEEEtran document class. If you are writing a conference paper or journal submission rather than a university thesis, LaTeX with IEEEtran is the most reliable route to correctly formatted references.

Online IEEE citation generators

MyBib, Citation Machine, and Cite This For Me offer browser-based IEEE citation generators. Enter a DOI, ISBN, or URL and they output a formatted reference. Always verify the output against the IEEE Reference Guide — automated tools occasionally misformat conference papers (especially the “Proc.” abbreviation) or omit required fields for standards.

Tesify

Tesify’s AI thesis assistant supports engineering and CS students at every stage of thesis writing — structuring chapters, drafting sections, and organising references. It runs an originality self-check so you can confirm that all cited material is correctly attributed before submission. Try it free at tesify.app.

IEEE vs other numbered citation styles

IEEE is one of three widely used numbered citation systems in academic and professional writing. The surface similarities mask important formatting differences:

The most visible difference in a submitted document is the in-text marker: IEEE uses bracketed numbers [1] while Vancouver and AMA use superscript numerals¹. The author name order is also inverted — a detail that causes errors when switching between styles.

Detailed guides to the other numbered styles are available: Vancouver citation style for medicine and health sciences and AMA citation style for the AMA Manual of Style 11th edition. If your thesis uses footnotes for legal citations rather than a numbered reference list, the OSCOLA referencing guide covers that system in equivalent depth.

Frequently Asked Questions