Cita APA (7th ed.)
McCarey, L., Kalmar, B., Ruby, H., Gilks, A., Stone, L., Marx, G., . . . Marx, C. Sopa de pato =: Duck Soup. Paramount Pictures.
Cita Chicago (17th ed.)
McCarey, Leo, Bert Kalmar, Harry Ruby, Alfred Gilks, LeRoy Stone, Groucho Marx, Harpo Marx, i Chico Marx. Sopa De Pato =: Duck Soup. Los Angeles, EUA: Paramount Pictures.
Cita MLA (9th ed.)
McCarey, Leo, et al. Sopa De Pato =: Duck Soup. Paramount Pictures.
Atenció: Aquestes cites poden no estar 100% correctes.