Cita APA (7a ed.)

Anobile, R. J., & Marx, G. (1972). Why a duck?: Visual and verbal gems from the Marx Brothers movies (1st ed. in Great Britain.). Studio Vista.

Cita Chicago Style (17a ed.)

Anobile, Richard J., y Groucho Marx. Why a Duck?: Visual and Verbal Gems from the Marx Brothers Movies. 1st ed. in Great Britain. London: Studio Vista, 1972.

Cita MLA (9a ed.)

Anobile, Richard J., y Groucho Marx. Why a Duck?: Visual and Verbal Gems from the Marx Brothers Movies. 1st ed. in Great Britain. Studio Vista, 1972.