APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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