Παραπομπή APA

Fry, R. (2003). Great big book of personal productivity. Viva Books.

Παραπομπή Chicago Style

Fry, Ron. Great Big Book of Personal Productivity. New Delhi: Viva Books, 2003.

Παραπομπή MLA

Fry, Ron. Great Big Book of Personal Productivity. Viva Books, 2003.