“A DOI, or digital object identifier, is a unique alphanumeric string that identifies content.” It is a document’s social security number. “The publisher assigns a DOI to a work when it is published.
DOIs are typically assigned to academic journal articles and research reports. They can also be assigned to governmental reports, data sets, books, conference proceedings, and media as some publishers choose to have DOIs assigned to these items
Follow the recommendation by the International DOI Foundation to format the DOIs in the reference list in the following manner:
When to Include DOIs and URLs (APA 7th, sections 9.34, pp 298-299)
Format of DOIs and URLs (APA 7th, section 9.35, p. 298)
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