Cita APA

Mandino, O. 1., & Mandino, O. 1. (1998). The greatest mystery in the world. New York, New York: Fawcett Crest.

Citación estilo Chicago

Mandino, Og 1923-1996, y Og 1923-1996 Mandino. The Greatest Mystery in the World. New York, New York: Fawcett Crest, 1998.

Cita MLA

Mandino, Og 1923-1996, y Og 1923-1996 Mandino. The Greatest Mystery in the World. New York, New York: Fawcett Crest, 1998.