Scholarly =/= Peer-review
All peer-review articles are scholarly, but not all scholarly articles are peer-review. Scholarly means that it's written for an academic audience, but it will depend on the publisher in terms of whether the work goes through the peer-review process. Make sure you are clear on what sources your professor is looking for.
To verify if an article is peer-reviewed, search the journal on Google. Most journals will have their editorial process listed on their website and specific if their content goes through peer-review or not.
Most often you can tell a work is scholarly if it has cited works, footnotes, endnotes, bibliography, or some combination of these different elements. The author(s) will connect their text to the largely scholarly conversation in which it takes place.
If you want to quickly see if an article is going to be relevant to you, you can read the abstract, introduction, and conclusion. These elements of the scholarly article should both introduce what the author(s) is looking to cover as well as highlight their main points.
Pay attention to the year the work was published. You'll want to try and find the most recent research that is being discussed on a given topic.