In the Literatures and Languages Library, most books having to do with specific films - including screenplays - will be found under call numbers beginning with PN1997, with expansions of the call number based alphabetically on the film's title. For example, a book on Annie Hall will be found under the call number PN1997.A4463 C69 - the "A4463" part of this call number comes from the fact that the film's title begins with "A."
If the book is on a film whose title is in a foreign language, this applies to the original title - for example, a book on Last Year at Marienbad appears under the call number PN1997.A446 L48, because the original title was L'Anneé dernière à Marienbad.
To find books at the library, search the online catalog.
Oskar Werner in Fahrenheit 451 (François Truffaut, France/UK 1966)
Humphrey Bogart in The Big Sleep (Howard Hawks, USA 1946)