In the library collection there are a few books (with pictures) about film posters.
Art of the Modern Movie Poster by 
A Century of Movie Posters by 
Imaging Blackness by 
Revolutionary Soviet Film Posters by 
Film Posters of the Russian Avant-Garde by 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.
Dictionary of Film Terms by 
The Film Studies Dictionary by 
Complete Film Dictionary by 
The American Film Industry by 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.