Παραπομπή APA

Mandino, O. (2007). greatest secret in the world. Jaico Publishing House.

Παραπομπή Chicago Style

Mandino, Og. Greatest Secret in the World. Mumbai: Jaico Publishing House, 2007.

Παραπομπή MLA

Mandino, Og. Greatest Secret in the World. Jaico Publishing House, 2007.