What is it?
It's a Digital Object Identifier -- a unique alphanumeric string that identifies articles, ebooks, standards, datasets, etc., and provides a persistent link to its online location.
Why use it?
It makes citing easier for you, and finding references easier for your reader.
You can put a DOI into a Web search and find the item it's linked to.
Put this into your browser: https://doi.org/10.1080/10242690701505419
Did you retrieve this article?
Sanico, Grace F., and Makoto Kakinaka. “Terrorism and Deterrence Policy with Transnational Support.” Defence and Peace Economics 19, no. 2 (April 2008): 153–67. https://doi.org/10.1080/10242690701505419.
*Note that in the citation, the DOI string is preceded by https://doi.org/
- If you're referencing something you got from a subscription database, you don't need to worry about including the URL to the journal, just add the DOI string as formatted above.