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There many different sources out there that you could possibly use, but which ones are the best? Burritt Library gives you access to a large number of them. What you will use will depend on your information needs.
What is your professor requiring you to use? Something current or historical? Something scholarly and in-deptth such as a journal article or something shorter an easier to understand such as a magazine article? Or both? What about books or encyclopedias? You can always ask a librarian for help.
Scholarly vs. Popular Sources
How to Read a Scholary Journal Article (It may not take as long as you think!)