Articles published in peer reviewed or refereed journals have been through a formal approval process. This process is intended to ensure that the article is:

• accurate
• well-researched
• contributing to the body of knowledge in the field

To find peer reviewed articles:

• select to show only peer reviewed journals in Primo Search
• limit to peer reviewed or scholarly journals in journal databases

However, as these options are just an indication of peer review status the definitive way to find out if your article has been peer reviewed is to use Ulrichsweb Global Periodicals Directory.