APA (7th ed.) Citation

Wood, S., Gerstad, M. B., Marx, G., Marx, C., & Marx, H. (2004). Marx Brothers in der Oper. Warner.

Chicago Style (17th ed.) Citation

Wood, Sam, Merritt B. Gerstad, Groucho Marx, Chico Marx, and Harpo Marx. Marx Brothers in Der Oper. Hamburg: Warner, 2004.

MLA (9th ed.) Citation

Wood, Sam, et al. Marx Brothers in Der Oper. Warner, 2004.