If you want to search exclusively for peer-reviewed journals, most databases and Summon Power Search will allow a user to limit results to only peer-reviewed journals. Often times, databases will call these “Scholarly Journals” or “Academic Journals.”
If you have a specific journal title you want to check:
Beside the search box, select “title” and type in the title of the journal.
When the journal title comes up, look to see if a icon of a Referee's Jersey is located to the left of the journal title. If so, the publication is peer-reviewed.
If you are unsure a article is peer reviewed or not after following these steps, contact a reference librarian.