John T. Soister, Of Gods and Monsters: A Critical Guide to Universal Studios' Science Fiction, Horror and Mystery Films, 1929-1939, McFarland, (ISBN978-1-4766-0499-2, lire en ligne), p. 379.
Tom Weaver, Michael Brunas et John Brunas, Universal Horrors: The Studio's Classic Films, 1931-1946, 2d ed., McFarland, (ISBN978-0-7864-9150-6, lire en ligne), p. 73.
Larry Langman, The Media in the Movies: A Catalog of American Journalism Films, 1900-1996, McFarland, (ISBN978-1-4766-0925-6, lire en ligne), p. 59.
Michael Slade Shull, Radicalism in American Silent Films, 1909-1929: A Filmography and History, McFarland, (ISBN978-1-4766-1103-7, lire en ligne), p. 61.