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What is a DOI?
APA uses a Digital Object Identifier (DOI), when it is available. A DOI is unique to each document and is considered more stable than a URL, which might change.
A DOI is usually found on the first page of the article or is listed on the database record. If there is no DOI, use the URL of the journal's website, even if you found the article in a database. (You may have to search for the website on the Internet.)
Journal article found in a database, no DOI
Anderson, W. K. Z., & Buzzanell, P. (2007). Outcasts among outcasts: Identity, gender and leadership in a Mac users group. Women and Language, 30(1), 32-46.
Journal article found in a database, with DOI
Greenfield, P., & Yan, Z. (2006). Children, adolescents, and the Internet: A new field of inquiry in developmental psychology [Special section]. Developmental Psychology
Journal article not from a Database, more than two authors
Ahmann, E., Tuttle, L. J., Saviet, M., & Wright, S.D. (2018). A descriptive review of ADHD coaching research: Implications for college students. Journal of Postsecondary Education and Disability
If you are using an article that you found in the hard copy of the journal (which means you are holding the complete journal in your hand), leave off all information about the retrieval.
Book review in print academic journal
Shoaf, E.C. (2011). On leading and being led. [Review of the book Leading from the middle, by J. Lubans]. College and Research Libraries News, 72(2), 102-103.
Article in print academic journal, no DOI
Meyerowitz, J. (2009). Transnational sex and U.S. history. The American Historical Review, 114, 1273-1286.