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Your capstone work involves primary source research. However, you will need to contextualize that work with secondary sources. Disciplinary encyclopedias can provide a basic grounding in the themes you're tackling and point you to relevant works in the field.
A search tool that lets you retrieve all types of research sources with one search. If you're looking for a variety of sources on your topic, or you're just getting started, UDiscover can help you access more information at once than ever before. It has a Google-like relevancy ranking, but helps you locate scholarly resources.