It's possible to limit your results to peer reviewed journals only, whether you use OneSearch, or the library databases.
Finding Peer-Reviewed Articles in OneSearch
You can start your research using the Search: Peer Reviewed option in One Search:
In OneSearch you can also use the "Peer Reviewed Journals" filter on the left after you perform a search:
Finding Peer-Reviewed Articles in Library Databases:
In almost any library database, you can also check the "Limit to: Peer Reviewed" box, usually found under the main search box. Here's an example in ProQuest PsycINFO:
TIP: Another option if you want to confirm a journal is peer-reviewed is to search the Ulrichsweb periodicals directory for the title of the journal. If you see this icon , the journal is refereed (peer-reviewed).You can find Ulrichsweb in the library under Databases A-Z.