Use the library on-line catalog to locate books relevant to your topic.
Unless you know the title and/or author of the book you are looking for, research topics should be searched by Keyword to maximize the number of references for a topic. If for example, you wanted to locate books about "the evolution of African American images in the media," you could enter "African Americans" and "media" as search terms.
Another way to search is to browse by Subject. A high number of subtopics is often an indication of an overly broad topic.