Your instructors will expect you to use credible sources for your writing assignments. Evaluating sources is difficult, but asking yourself some critical questions about each of your potential sources can really help. The following questions are just a starting point, but can help you quickly weed out less useful sources and then more closely examine what you have left.
Does the source help answer your specific research question?
Do you understand the source? Do you need any background information to understanding specialized terminology?
Does the source conform to your assignment instructions?
Is the source useful for your project? (e.g., gives background information; leads to additional sources; provides corroborating evidence or verification; presents an opposing viewpoint)