Answered By: Lindley Homol Last Updated: Aug 23, 2016 Views: 233
DOI stands for "digital object identifier."
A DOI is an alphanumeric string (meaning that it contains both letters and numbers) that is used to uniquely identify an online journal article or online book chapter, etc. All DOIs contain 10. followed by four numbers and then a forward slash and then a string of letters and/or numbers -- for example: 10.1093/jopart/muq015
You will sometimes see an article's DOI in the article's record in a database. Article DOIs may also be found on the first or last page of an article's PDF.
Note, though, that not all online journal articles have a DOI, since it's optional for publishers to assign a DOI to an article.
If you are citing an online journal article using APA style, the article's DOI should be the last element of your citation. For more information about citing an article with a DOI, please see the library's APA citation examples for academic journal articles.
The APA citation examples page noted above also gives instructions for citing an online journal article that doesn't have a DOI.