Many databases offer checkboxes that allow you to limit your search to "Scholarly" or "Peer Reviewed" articles. While this option is very helpful, it does not necessarily guarantee that the results will be peer-reviewed... so you will still have to use your evaluative skills to make the call!
You can also search for a journal title in Ulrich's to see if it is peer reviewed:
You can use databases' search settings to limit your search results based on the requirements of your assignment. For your assignment, you will need to limit the articles by date, peer-review status and type. Watch this short video to learn how to do this.