Apollo Movie Guide: Review, links, and cast information.
Elmer Gantry (1960) - The Essentials: Turner Classic Movies looks at the film, and John Alton's cinematography in particular.
Greatest Films - Elmer Gantry: Review, synopsis and discussion of the film
IMDb - Elmer Gantry: Cast/credits plus additional information about the film
Nutzworld: Reviewed, and compared with the novel, by Brian W. Fairbanks.
TV Guide Online: Elmer Gantry: Review and credits.