Cita APA (7th ed.)

Cent, 5. G. (2009). The 50th Law (1st.). Profile Book.

Cita Chicago (17th ed.)

Cent, 50; Greene. The 50th Law. 1st. London: Profile Book, 2009.

Cita MLA (9th ed.)

Cent, 50; Greene. The 50th Law. 1st. Profile Book, 2009.