Not all journal articles are peer-reviewed because not all journals are peer-reviewed.
Articles in peer-reviewed journals are reviewed by a group of the writer's peers (other academics in their field) before the articles are published.
It might sound confusing, but you know that an article is peer-reviewed if it comes from a peer-reviewed journal.
You can find out if a journal (and its articles) is peer-reviewed by searching for the journal title in Ulrich's, as described in the box to the right.
What is Ulrich's?
Ulrich's periodical directory is a tool that allows you to check if the journal in which an article is published is peer-reviewed. This is important as your instructors will often insist that you use peer-reviewed journals.
Peer-reviewed journals are reviewed by a committee of peers (other researchers in the field). Content is approved by the committee before it is published.
Is Your Journal Article Peer-Reviewed?
How do you know if the articles in a journal are peer-reviewed? Check Ulrich's.
Some databases allow you to limit to peer-reviewed articles. For other databases, you need to look up the title of the journal in Ulrich's.