Research is a process that takes TIME. Start early and do a little bit each day. You will NOT have a thesis statement after one day in the library. You need to learn a little bit about your topic before you can develop an argument!
Right: Raphael. School of Athens. 1509–11. Apostolic Palace, Vatican City.
Here's a list of selected specialized reference books (available in the Garver Room) you may want to consider: