In addition to your textbook and class lectures, topics for your paper may be found by looking through journals on the topic. Here are a few journals that cover the Renaissance and Reformation periods that might give you ideas for a paper topic.
You can also look for specific people. See the box on the right for a short list of significant people in the renaissance. There are many more so don't limit yourself to these examples.
History
D101-110.5 Medieval and modern history, 476
D111-203 Medieval history
Literature
PN661-694 Medieval (to 1500)
PN695-779 Modern
Music
ML 169.8-190 Medieval and Renaissance
Philosophy
B720-765 Medieval
B770-785 Renaissance