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Looking up a DOI
DOIs or digital object identifiers are serial numbers that identify a source regardless of URL changes.
APA Manual: Changes from the 6th edition to the 7th edition
To view a list of changes from the 6th to 7th edition please review this website.
Introducing the 7th Ed. APA Style Publication Manual
About APA Style, 7th Edition
The Publication Manual of the American Psychological Association sets the standard for the format of scholarly publications in the social sciences.