If you are unsure if an article is from a peer reviewed journal you can check Ulrichsweb. Ulrichweb is a directory that include journals and magazines.
Connect to Ulrichsweb
Search for the Journal title. Note, you will not be able to search by article title.
Check the results. If a referee jersey is seen by the journal title is indicates that the journal is peer reviewed. If you want to learn more about the journal click the journal title.