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Often you will be asked to include peer-reviewed literature in your writing. Fortunately, many databases include a Scholarly/Peer-Reviewed/Academic Journal limiter to help you determine is an article is indeed peer reviewed.
Profiles nearly a quarter of a million consumer and trade magazines, academic and scholarly publications, monographic series, newsletters, newspapers, electronic publications, 'zines, and many other types of serial publications on all subjects.
Peer Review in 3 Minutes
This video explains the peer review process of scholarly articles.