Most professors want your research to come from Peer Reviewed or Scholarly Sources. The sources listed here are secondary resources and not peer reviewed or scholarly. They are encyclopedia-like sources for quick background information. Usually they will have the work cited, reference, or source lists. You can locate the items in those lists for use in your paper. (There may even be links to them on the page.)
Remember you can limit your serch to Peer Reviewed or Scholarly Journals if that choice is given in the search interface. For any Ebscohost or ProQuest databases, use the advanced search option. Doing this will remove magazines, newspapers, and trade journals.
Electronic Journals Service (Ebsco)
Google Scholar (click more info for HCU recognition)
Serials Directory (Ebsco) (TexShare)
WorldCat (FirstSearch) (TexShare)