Vancouver referencing style is popularly used in the medicine field. This style uses the numerical approach which correlates to the reference list that provide more information about the source.
Vancouver has two components:
This guide follows the rules set by Citing Medicine: The NLM Style Guide for Authors, Editors and Publishers. You may wish to consult this online book by the National Library of Medicine (NLM) for more detailed examples.
Vancouver style allows for three alternatives:
The table below illustrates few samples of in-text citations and reference list.
For many other detailed examples, please refer to the Citing Medicine: The NLM Style Guide for Authors, Editors and Publishers.
Recall and precision were expressed as percentages with 95% confidence intervals which were calculated using exact methods .
11. Fleiss JL: Statistical Methods for Rates and Proportions New York, NY: John Wiley & Sons Ltd; 1981
The Cochrane Collaboration maintains that handsearching is vital to the credibility and success of systematic reviews .
7. Dickersin K, Manheimer E, Wieland S, Robinson KA, Lefebvre C, McDonald S: Development of the Cochrane Collaboration's CENTRAL Register of controlled clinical trials. Eval Health Prof 2002, 25:38-64.
.......reporting flaw(s) which could not be clarified by author(s) 
References list:19. Kennedy G, Rutherford G: Identifying randomized controlled trials in the journal Aids. Proceedings of the 8th Annual Cochrane Colloqnium. October 2000; South Africa
Reviewers are encouraged to search numerous resources in order to identify as many relevant studies as possible without systematically introducing bias .
References list:4. Locating and selecting studies for reviews In: The Cochrane Library, Issue 1, 2004. In Cochrane Reviewers' Handbook 4.2.2 [updated December 2003] Edited by: Alderson P, Green S, Higgins JPT. Chichester, UK: John Wiley & Sons, Ltd; 2004.
Adapted from Crumley, E.T., Wiebe, N., Cramer, K. et al. Which resources should be used to identify RCT/CCTs for systematic reviews: a systematic review. BMC Med Res Methodol 5, 24 (2005). https://doi.org/10.1186/1471-2288-5-24.
This an open access article distributed under the terms of the Creative Commons CC BY license. We wish to acknowledge the authors for using portions of the article to illustrate in-text citations and referencing samples in Vancouver style.