Reference materials are designed to help provide background information about people, events, concepts, and more related to our topic. You want to gather enough information that you can begin searching in library databases for Scholarly/Secondary Sources. We recommend you take notes on important concepts to help you search later!
Things to track:
Reference books by Oxford University Press, including the Oxford Digital Reference Shelf.
Not sure if it's okay to use Wikipedia or a web search as a starting point for your research? Check with your instructor or a librarian!
For an overview of the issue, check out Wikipedia's Citing Wikipedia article!