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Journal articles and Academic Books are often, but not always, peer reviewed. This means that before they are published, they are reviewed by several scholars who are “peers” of the author(s). However, with both kinds of resources, whether or not they go through the peer review process depends on the publisher. To identify whether an article/journal is peer reviewed, see below. For books, some ways to find out are to:
Ask your professor what they think of the publisher