Answered By: Ask a Librarian
Last Updated: Feb 26, 2020    

Not every article has a DOI.

You might be unable to find DOI for the following reasons:

  • DOI is a new thing from 1998. So some age-old documents don’t have DOIs like articles published prior to 2000.
  • There are some presses or journals haven’t registered a DOI. Thus, they don’t require authors to tag the DOI.
  • The article may be too new to enter DOI system.