Find books using the library catalog.
Keywords for your research will vary, depending on your topic. Typically searching a few important words works best for the library catalog. Some examples are below.
Historical Time Period:
renaissance AND 15th century
renaissance AND Italian
Use synonyms and try searching with those terms.
Ex: fashion OR costume OR clothing
Actual physical browsing (in the stacks) can sometimes help you find what you didn't realize you needed. Begin by finding a record for a print book in the catalog and then browse in that Call Number range on the upper level Circulating Collection (books you can take home) and the main floor in the Reference Collection.
Search Google Books to find partial and full text of the books you need!