Vancouver Referencing Style A Practical Guide

The Vancouver style (also known as the Uniform Requirements for Manuscripts Submitted to Biomedical Journals) is the most widely used citation system in the health and biomedical sciences. It employs a numeric, sequential system that links intext citations to a numbered reference list at the end of the document. This page explains the essential elements of the style, provides examples for common source types, and offers tips for correct implementation.

When to Use Vancouver

• Manuscripts for medical, dental, nursing, and allied health journals.
• Graduate theses in healthrelated fields.
• Conference papers and posters in biomedical sciences.

Core Principles

1. Numbered citations each source receives a unique number the first time it is cited. The same number is reused for subsequent citations of that source.
2. Sequential ordering numbers appear in the reference list in the order they occur in the text, not alphabetically.
3. Compact intext format numbers are placed in parentheses or square brackets, e.g., (1) or [1].
4. Full reference details the reference list provides all necessary bibliographic information for the reader to locate the source.

InText Citation Formats

Both of the following are acceptable, but you should follow the journals specific preference:

• Parenthetical: (1), (24)
• Squarebracket: [1], [24]

When citing the same source multiple times, reuse the original number:

The prevalence of hypertension has risen globally (1). Recent surveys confirm the trend (1).

Structure of the Reference List

Each entry follows a specific order and punctuation style. The most common elements are:

1. Authors surname followed by initials without periods, up to six authors; for more than six, list the first six followed by et al..
2. Title of article sentence case, no quotation marks.
3. Journal title abbreviated according to the Index Medicus (NLM) style.
4. Year; volume(issue):pagerange.

General Formatting Rules

• Use a single space after each punctuation mark.
• Do not italicise journal titles; only the volume number is italicised in some journals, but the Vancouver core does not require it.
• End each reference with a period.

Examples for Common Source Types

Journal Article

Format: 1. Author(s). Title of article. Abbrev Journal Title. Year;Volume(Issue):Pagerange.

Example:

1. Smith J, Patel R, Lee K, et al. Early detection of Alzheimers disease using plasma biomarkers. J Neurol Sci. 2023;425(2):112118.

Book

Format: 2. Author(s). Title of Book. Edition. Place of publication: Publisher; Year.

Example:

2. Brown L, Green M. Principles of Epidemiology. 3rd ed. New York: Oxford University Press; 2020.

Edited Book Chapter

Format: 3. Author(s) of chapter. Title of chapter. In: Editor(s), eds. Title of Book. Edition. Place of publication: Publisher; Year. p. pagerange.

Example:

3. Wang H, Carver J. Nutritional assessments in intensive care. In: Collins R, Mason T, eds. Critical Care Nutrition. 2nd ed. London: Springer; 2021. p. 4562.

Online Journal Article (with DOI)

Format: 4. Author(s). Title of article. Abbrev Journal Title. Year;Volume(Issue):Pagerange. doi:xxxxx

Example:

4. Ortega L, Kim S. Telemedicine adoption during the COVID19 pandemic. Telemed J. 2022;15(4):215221. doi:10.1001/tmj.2022.015.

Website

Format: 5. Author or organization. Title of page. Name of website. Year [cited Year Month Day]. Available from: URL

Example:

5. World Health Organization. Antimicrobial resistance. WHO. 2023 [cited 2024 Apr 10]. Available from: https://www.who.int/antimicrobial-resistance

Special Cases

More Than Six Authors

If a source has more than six authors, list the first six followed by et al. Example:

6. Johnson A, Lee B, Patel C, Smith D, Wong E, ONeil F, et al. Impact of diet on gut microbiota. Nutr Res Rev. 2021;34(3):210218.

Multiple Works by the Same Author in the Same Year

Assign letters a, b, c after the year in both the intext citation and the reference list:

Intext: (7a, 7b)

Reference list:

7a. Miller T. Vaccine hesitancy: a systematic review. Vaccine. 2020;38(12):26252632.

7b. Miller T. Strategies to improve vaccine uptake. J Public Health. 2020;42(5):981989.

Anonymous Works

Use the title in place of the author, but still assign a number:

8. Guidelines for clinical trials. Clinical Trials Handbook. 2019;5:101115.

Tips for Accurate Referencing

• Keep a running list of sources as you write; this prevents numbering errors.
• Use a reference manager (EndNote, Zotero, Mendeley) that supports Vancouver output.
• Check journal-specific variations; some require the month of publication or superscript numbers.
• Verify journal abbreviations using the NLM Catalog.
• When a DOI is available, always include it; it ensures a permanent link.

Common Mistakes to Avoid

1. Incorrect author formatting omit periods after initials and use commas to separate authors.
2. Missing page numbers provide the full range (e.g., 112118), not just the first page.
3. Alphabetical ordering the reference list must follow the order of citation, not alphabetically.
4. Inconsistent citation brackets stick to either parentheses or square brackets throughout the manuscript.
5. Forgetting the accessed date for web sources always include the date you last accessed the site.

Quick Reference Table

Conclusion

The Vancouver referencing style offers a concise, numeric system that is wellsuited to the rapid flow of information in biomedical literature. Mastery of its rulesparticularly the order of authors, journal abbreviations, and sequential numberingensures that your manuscript meets the expectations of editors and readers alike. By using a reference manager and doublechecking each entry against the official Uniform Requirements, you can minimise errors and focus on the scientific contribution of your work.

For further guidance, consult the International Committee of Medical Journal Editors (ICMJE) recommendations or the specific author instructions of the journal you are submitting to.