Q. How do I know if a journal is peer-reviewed?

Go to the journal's/publisher's web page. If it's peer-reviewed, it'll say.

OR

You can look up the journal in Ulrich's Periodicals Directory (at the RIS desk - Z6941 .U5)

OR

Use the online database Serials Directory. Type in the name of the journal and scroll down near the bottom of the record. You will find "Yes" or "No" next to Peer Reviewed.