Peer review, also called refereeing, is a prepublication process used by most scholarly journals. To find them, use subject databases that specialize in your field, which are more likely to include peer-reviewed journals. Many databases also include a "peer-reviewed articles only" checkbox.
Also see "How can I tell if this article is refereed/peer-reviewed/scholarly?" to make sure that what you found is, in fact, refereed.
And "What do "peer reviewed," "refereed," and "scholarly" mean for an article?" if you would like more information.