Resources listed in Library Search that are peer reviewed will include the Peer Reviewed icon.
For example:
If you have not used Library Search to find the article, which may indicate if it's peer reviewed, you can use Ulrichsweb to check.
Be aware that not all articles in peer reviewed journals are refereed or peer reviewed, for example, editorials and book reviews.
If the journal is not listed in Ulrichsweb:
If you can find no evidence that a journal is peer reviewed, but you are required to have a refereed article, you may need to choose a different article.