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Articles published in peer reviewed or refereed journals have been through a formal approval process, they are reviewed by subject specialists before being accepted for publication. This process is intended to ensure that the article is:
contributing to the body of knowledge in the field
To find peer reviewed articles:
Select to show only peer reviewed journals in Primo Search
Limit to peer reviewed or scholarly journals in journal databases
However, as these options are just an indication of peer review status the definitive way to find out if your article has been peer reviewed is to use Ulrichsweb Global Serials Directory.
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Log in to Ulrichsweb Global Serial Directory now to check whether the articles you have found are from peer reviewed journals. Remember to search using the Journal title, not the article title.