Cita APA (7th ed.)

Levitt, S. D., & Duvner, S. J. (2006). Freakonomics. B.

Cita Chicago (17th ed.)

Levitt, Steven D., i Sthepen J. Duvner. Freakonomics. Barcelona: B, 2006.

Cita MLA (9th ed.)

Levitt, Steven D., i Sthepen J. Duvner. Freakonomics. B, 2006.