Q. How do I find an article’s DOI?
If an article has a DOI (Digital Object Identifier), it’s typically included with other basic article information in the library catalog and databases. For example, this record in an EBSCO database
this article PDF
as well as this article PDF and in the article info on the right (part of SAGE database)
You can also try searching for an article in Google or Google Scholar, which may bring you to the publisher website with DOI, if available. Another option to search is in a DOI registration agency like CrossRef -- CrossRef's free DOI lookup.