Q. How do I use article numbers in my reference list?

Articles published in an online journal may not be published the same way as articles in print. Some do not have volume or issue numbers, and some online articles always start at page 1, so page numbers are irrelevant in the reference list.

The first thing to check is how the article recommends citation (if you can find this information), as it will let you know how the journal is using the article numbers (as a replacement for page numbers? Instead of all of the volume/issue/page number details?)

Then use the article number in it's entirity - including any letters - according to the instructions of your style.

AMA example:

1.    Kitts-Morgan SE, Caires KC, Bohannon LA, Parsons EI, Hilburn KA. Free-ranging farm cats: Home range size and predation on a livestock unit in northwest Georgia. PLoS ONE. 2015;10(4):e0120513. doi:10.1371/journal.pone.0120513

APA example:

If your journal used the article number instead of the volume, issue and page number, simply omit any details you don't have.

When citing the article in text, if you need to use a direct quote and your style requires a page number, you will still need to use the page number within the article itself. For example: (Kitts-Morgan et al., 2015, p. 6). If your article does not have a form with a page number (such as a PDF), you will need to provide a paragraph number instead (para. 27).