Many film reference books are found in the Reference Room in the 791 call number range -- for example:
Schirmer encyclopedia of film / Barry Keith Grant MAIN Reference (Non-circulating) Call number: 791.4303 G761s (4 vols)
Gale Virtual Reference Library
Searchable database of approximately fifty full text encyclopedias, dictionaries and other reference books in the areas of the arts, business, education, history, information and publishing, law, medicine, multicultural studies, nation and world, religion, and social science.
Searchable access to a collection of aggregated and integrated encyclopedias and reference books across many subjects.
Created by Northwestern University Library's own subject librarians, these pages guide the researcher to the best resources across many subjects and disciplines.
Radio / TV / Film research guide
"How to Find" Guides
Created by librarians in the Northwestern University Library Reference Department, these guides provide direction in how to find many types of resources.