Below is some text from your assignment indicating expectations for your research:
Cite your sources. The number of sources that you choose to cite is up to you. Suffice it to say, if your essay does not cite any sources, I will consider it to be a very weak essay and it will receive a correspondingly weak grade. Sources establish your credibility as a trustworthy writer, revealing to your audience that you have taken the time to research and think deeply about your subject. Sources must be reputable, e.g.: databases, newspapers, magazines, academic journals, government web sites, and books. Please do not cite Jo-Bozo blogs, commercial, or random Internet sites. Additionally, you cannot cite Wikipedia as a source, but you are certainly welcome to use Wikipedia to begin your research. Often the links on Wikipedia will lead you to more reputable sources.
You can use this guide as a reference for the kinds of sources your professor is looking for. Also be sure to check in with librarians whenever you have questions!