Books about Movie Posters
In the library collection there are a few books (with pictures) about film posters.
Film Reference Books
All of these books can be found in the reference collection (located behind the Research Help Desk) or the 3rd floor of Penfield and will provide you with a concise introduction to the genres and terms associated with movies.
Books about Movies
The University of California Berkley library put together a bibliography of books, movies, and articles about film genre. It is probably more in depth than this project requires, but if you're interested in film genre it is worth taking a look at.