A Day at the Races. Dir. Sam Wood. MGM, 1937.
Duck Soup. Dir. Leo McCarey. Paramount, 1933.
Horse Feathers. Dir. Norman Z. McLeod. Paramount, 1932.
Monkey Business. Dir. Norman Z. McLeod. Paramount, 1931.
A Night at the Opera. Dir. Sam Wood. MGM, 1935.
Strange Interlude. Dir. Herbert Wise. Videocassette. Bowden Productions Limited and Fries Entertainment Inc., 1988.
The Unknown Marx Brothers. Dir. David Leaf and John Scheinfeld. DVD. Fox Lorber Associates Inc., 1993.
Books and Articles
Bergson, Henri. Laughter: An Essay on the Meaning of the Comic. trans. by Cloudesley Brereton and Fred Rothwell. New York: The MacMillan Company, 1913.
Butler, Judith. "Imitation and Gender Insubordination." Inside/Out: Lesbian Theories, Gay Theories. ed. Diana Fuss. New York: Routledge, 1991: 13-31.
Chandler, Charlotte. Hello, I Must Be Going: Groucho and His Friends. Garden City, NY: Doubleday & Company, Inc., 1978.
Marx, Groucho. The Groucho Letters. New York: Manor Books, Inc., 1967.
O'Neill, Eugene. A Play: Strange Interlude. New York: Boni & Liveright, 1928.
Welsford, End. The Fool: His Social and Literary History. London: Faber and Faber, 1935.
Willeford, William. The Fool and His Scepter: A Study in Clowns and Jesters and Their Audiences. Northwestern University Press, 1969.
Zimmerman, Paul D., and Burt Goldblatt. The Marx Brothers at the Movies. New York: G.P. Putnam's Sons, 1968.
The Marx Brothers: The Winsome Foursome--a large site that covers a variety of topics
The Inimitable Marx Brothers!--this collection includes audio and video files
The Marx Brothers Night at the Opera Treasury--an impressive site focuses on A Night at the Opera
The Greatest Films--features extensive information and plot summaries of several Marx Brothers films