Answered By: Hacherl Research & Writing Studio
Last Updated: Jan 09, 2018     Views: 962

The DOI number is usually on the first page of an article (top or bottom) and sometimes on the last page. Often a database (Academic Search Complete, PsycInfo) will have the DOI in a searchable field and visible from the full citation. has a free search for DOI numbers:

The APA Style Blog has a quick tutorial:  DOI Tutorial