Answered By: Emily Scharf
Last Updated: May 19, 2015     Views: 91

A DOI or Digital Object Identifier is a unique identification number typically assigned to online articles. You can see an example at the very end of this citation:

If you are using APA style for your research papers, use the DOI in citations whenever possible. You can usually find the DOI for journal articles in the online database you are using for your research.  If no DOI is present, try the free DOI lookup from CrossRef. For more information, watch the short video, Citing an article with a DOI and without a DOI (University of Maryland University College).