The seventh edition of the Publication Manual of the American Psychological Association was released in October 2019. Be sure to check with your instructor about which edition to use.
Since 2000 there has been an effort to assign everything that exists in the digital world such as online articles with a unique number called a Digital Object Identifier or a DOI. The DOI is unique, permanent, and persistent. It remains the same despite changes in URL's or permanent removal from the Internet.
In APA and AMA styles, use the DOI in citations whenever one is listed.
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