Cita APA (7th ed.)

Kanfer, S., & Marx, G. (2008). The essential Groucho: Writings by, for and about Groucho Marx. Penguin.

Cita Chicago (17th ed.)

Kanfer, Stefan, i Groucho Marx. The Essential Groucho: Writings by, for and About Groucho Marx. London: Penguin, 2008.

Cita MLA (9th ed.)

Kanfer, Stefan, i Groucho Marx. The Essential Groucho: Writings by, for and About Groucho Marx. Penguin, 2008.