You may choose to use scholarly Peer Reviewed articles in your assignment. These types of resources are found in academic journals.
Are you unsure what "peer review" means? Check out this this video for a quick overview: Peer Review in 3 Minutes (NCSU Libraries).
Most databases provide you the option of limiting your search results to peer reviewed or scholarly resources. For instance, when searching the Library's Quick Topic Search, you will see this filter on the left-side of the screen after you have entered your search.