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APA Style (7th ed.)

Introduction and examples of commonly cited works in APA Style, 7th edition

DOI (Digital Object Identifier)

DOI Tools

The Digital Object Identifier (DOI) is a unique number assigned to electronic content, and should be part of your APA citation when available.

DOI Lookup:

Frequently Asked Questions about DOI Numbers

Introduction to the DOI Number
How to change from the old format to the new format
When we cannot find the DOI Number
Comparing the DOI Number with URLs and the Retrieval Date