There are several ways to determine if a journal is peer-reviewed.
The easiest way is to use the library databases and limit your search to peer-reviewed journals. Then you'll know that all of your results are peer-reviewed. Usually the filters will be on the left-hand side of the screen after you do a search.
You can also Google the name of the journal and visit their website directly. If the journal is peer-reviewed, that will be stated on the website (usually on the About page).
Please contact a librarian at refdesk@naz.edu if you need extra help finding peer-reviewed articles.