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.

Selecting journals which are peer-reviewed is an important aspect of assignment preparation  at an academic level. Ulrichsweb Global Serials Directory is the major source for this detail.Ulrichs uses a symbol to  to identify which journals are preferred for use in academic writing. The  symbol appears as a "Referee's jumper", like this: 

Peer review means they have been subject to a strict process of review by authorities in the same academic field as the author and the journal has ensured that the work is the intellectual property of this author, has not been published elsewhere previously and is a new contribution to the existing scholarship on this topic.

Journals without this symbol are not as reliable, and it is recommended that you do not use them.