Vancouver, a "numbered" style, follows rules established by the International Committee of Medical Journal Editors . It is also known as: Uniform Requirements for Manuscripts Submitted to Biomedical Journals; from Monash Univeristy
International Committee of Medical Journal Editors (ICMJE) Uniform Requirements for Manuscripts Submitted to Biomedical Journals: Sample References; from the National Library of Medicine / National Institutes Health
From the University of Auckland, Philson Library; Provides basic elements of a reference, shows examples of different types of references for journal articles, books, web sites. etc, shows features of the Vancouver style such as layout and punctuation.
From the University of Western Australia; look at the second reference on this page for a journal article from a LIBRARY DATABASE - this is what you will need to use!