Answered By: Larisa Smyk Last Updated: Aug 17, 2016 Views: 157
Some citation styles (such as APA) require DOI for referencing articles from electronic databases.
A digital object identifier (DOI) is a unique alphanumeric string that identifies content and provide a persistent link to its location on the Internet. The publisher assigns a DOI when the article is published and made available electronically.
Where to find DOI?