Journals and Magazines: This guide details the characteristics of each category.
Ulrich's International Periodicals Directory: Entries include information about whether the journal or magazine is a scholarly journal, consumer magazine, etc.
Paper journals: Frequently include instruction for authors in the front or back of the journal. Some instructions will use the phrase "peer reviewed." Others will say that manuscripts are sent for blind review, reviewed by a committee, or anonymously reviewed.
Research Databases: Some allow you to limit your search to scholarly journals.
This video is from Bowman Library at Menlo College.