Cita APA (7th ed.)

Levitt, S. D. D. (2005). Freakonomics. Penguin Books.

Cita Chicago (17th ed.)

Levitt, Steven D; Dubner. Freakonomics. New Delhi: Penguin Books, 2005.

Cita MLA (9th ed.)

Levitt, Steven D; Dubner. Freakonomics. Penguin Books, 2005.