Cita APA (7th ed.)

Mandino, O. (1968). The greatest salesman in the world. Frederick Fell.

Cita Chicago (17th ed.)

Mandino, Og. The Greatest Salesman in the World. New York: Frederick Fell, 1968.

Cita MLA (9th ed.)

Mandino, Og. The Greatest Salesman in the World. Frederick Fell, 1968.