Most books having to do with specific films - including screenplays of specific titles - are shelved 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 has call number PN1997.A4463 C69 - the "A4463" part of this call number indicates that the film's title begins with the letter "A."
If the film's original title is in a language other than English, then the call number may reflect the spelling of the original title: For example, a book on Last Year at Marienbad may appear under the call number PN1997.A446 L48, because the original French title of the film is 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)