What is a DOI and how can I find it?


DOI stands for Digital Object Identifier. A DOI is a string of numbers, letters and symbols used to permanently identify an article or document and link to it on the web. You can think of a DOI as a Social Security Number for an article. Unlike URLs, DOIs never change. 

This is what a DOI looks like: 10.2522/ptj.20090278 

You can create a link out of a DOI by adding the prefix: doi.org/ 

Here is a list of common places where you can find the DOI for an article:

  • First page of the electronic journal article
  • Near the copyright notice
  • Database landing page for an article
  • In the citation generated by the database
  • Online using the free DOI lookup

If you have a DOI and want to find the article, you can use the International DOI Foundation's Resolve a DOI Name feature.

Many citation styles prefer using DOIs over URLs to link back to an article because DOIs are more permanent. If you need help citing a source, check out our Citation Help guide. 


  • Last Updated Aug 22, 2022
  • Views 39
  • Answered By Librarian

FAQ Actions

Was this helpful? 0 0