Review your assignment to be sure what kind of resources you need. You may see something like this:
Find 5 scholarly articles on your topic.
You will need 7 sources. 3 must be scholarly articles, 2 from reliable web sources, 1 book and 1 encyclopedia article.
Every topic has an information cycle of when information about the topic is published. For example, scholarly articles on a topic will not be published for at least a year. If your topic is date specific, you need to know when different kinds of publications will address your topic.