APA (7th ed.) Citation

Marx, G., Marx, H., Marx, C., & Brecher, I. (2004). Go west. Warner Home Video.

Chicago Style (17th ed.) Citation

Marx, Groucho, Harpo Marx, Chico Marx, and Irving Brecher. Go West. Hamburg: Warner Home Video, 2004.

MLA (9th ed.) Citation

Marx, Groucho, et al. Go West. Warner Home Video, 2004.