The following Library databases may be used to retrieve articles written by critics and academics about film and literature.
You can enter the title of the film in any of these databases and find articles. To broaden your search, consider using the name of the Director, Actor, Producer, Novelist, or including the theme, genre or style elements of the film. E.g.:
PRISON FILM and Shawshank WAR SCENE in Atonement CLASS in Atonement Puzo and "IMMIGRATION Story" JUSTICE and To Kill a mockingbird
The databases Academic Search Complete and Literature Resource Center offer more in the way of critical reviews and papers.