In many of our databases, you can click on the journal title from your results list and get more information. Often this information includes whether it is peer reviewed (or refereed) or not.
If that information is missing or you are still unclear, you can Google JOURNAL NAME AND PEER REVIEW to get more information.
Another resource to use is a library database called Ulrich's. Search for the journal title and you can find publication information for the journal. If it includes a black and white referee shirt, then it is a peer reviewed journal. You will still need to check that the articles you use are peer-reviewed.