If you want to cite a journal article in Vancouver, you need the following pieces of information.
- A list of authors with their last names and initials
- The title of work
- The title of the journal it was published in (in short form)
- The information of the journal it was published in (Volume and number)
- Start and end page numbers
- The full date it was published
- The DOI (document object identifier) if provided
For example...
Doe J, Day T. A Fake Title. J Fake. 2017 Jul 1;1(1):34-38. doi: f0a0k0e/j0urn4l
Doe J, Day T, Rowe R. A Second Fake Title. J Fake 2017 Aug 1;1(1):38-42. doi: f0a0k0e/j0urn5l
