A scholarly journal that uses the peer review process before publishing articles is described as a refereed journal.
An article that has undergone scrutiny of other scholars and researchers is described as a peer-reviewed article.
Many databases provide a search limiter that help you eliminate publications such as magazines, newspapers, and trade journals. Look for a limiter option such as this:
When searching for articles using Google Scholar, however, you need to ascertain that a journal is refereed. Use the tools on this page, such as Ulrichsweb to help you identify this information.
Peer Review in Three Minutes: What is peer review? (video)
Video Tutorial: How can I find peer-reviewed articles using EBSCOhost?
Ulrichsweb: How can I identify whether a journal is peer-reviewed? Search for a magazine or journal by title. If it is identified with a referee shirt, it is a refereed publication, and most articles in the publication will be peer reviewed.