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There are a few different ways to look for and find a DOI. First, you can look in the list of database results by the article's other information, like author and journal name (see image below). It's also usually on the bottom of the abstract page of the article (when you click on the article title). You can also look at the very bottom or top of the first page of the PDF of the article, it's often located there. Finally, if you still don't find the DOI in any of those places, search for the title of the article in the metadata at the website crossref.org. If the article has a DOI, you will find it at crossref.org
Need help citing an article with no DOI? We can help with that too!