A digital object identifier (DOI) is a unique alphanumeric string assigned by a registration agency (the International DOI Foundation) to identify content and provide a persistent link to its location on the Internet. The publisher assigns a DOI when the article is published and made available electronically. The DOI can be found in the citation for the article from the database you are searching or sometimes printed on the article near the copyright information.
If you cannot find a Digital Object Identifier (DOI) number in the reference citation or on the article, just leave the DOI element out of the APA citation. If this is the case, the citation would end with the page numbers of the article.
Author's Last Name, Author's First Initial. Author's Middle Initial. (Year, Month/Date/Season). Title of article.
Title of Journal/Magazine, Volume(Issue), Page(s). doi:xx.xxxxxxx
Sutherland, M. B. (2000). Problems of diversity in policy and practice: Celtic languages in the United Kingdom
Comparative Education, 36(2), 199-209. doi:10.1080/03050060050045363
Elmer-DeWitt, P., & Farley, C. J. (1994 June). People who eat Hostess Twinkies. Time, 143(12), 22.
Gubbins, H., O'Halloran, S.,
practice of musicology in
Clay, R. (2008, June). Science vs. ideology: Psychologists fight back about the misuse of research. Monitor on
Psychology, 39(6), Retrieved from http://www.apa.org/monitor