The citation information is given on the right navigation bar next to each article:
Please always include the DOI when you cite an article.
If you use a bibliographic citation manager such as Endnote, use the links underneath the citation information to export the citation.
Alternatively, you can copy & paste the citation information into your clipboard by clicking on the blue button "Copy Citation to Clipboard" (use command-V on a Mac or CTRL-v on Windows to paste the citation into your application).
As JMIR articles are electronic only, the do not have page number, but instead an article-ID (e.g. "e108"). This is a common way to cite electronic articles. Do not omit the article-ID from your citation. Use it instead of page numbers. Electronic articles do not have page numbers.
If you are an author of an accepted article which is not published yet, please read As author, how can I cite my accepted but not yet published article (in press/forthcoming JMIR article). That article also explains how the DOI is built.