Finding a DOI
APA 6th edition now requires the addition of DOI numbers. A DOI or Digital Object Identifier is a unique number that allows the establishment of a permanent link to an article. When a DOI number is present, the database name and URL are left out. To find a DOI, try the following:
- Check the citation and abstract in the database.
- Check the first page of an article, especially in PDF format.
- Use DOI lookup.
- Cut and paste a citation into CrossRef Simple Text Query.
Keep in mind that not all publishers have registered with the International DOI Foundation, so there may not be a DOI for your article. If you cannot find one, then use the URL in the citation.