Fry, R. A. (2003). The great big book of personal productivity.
Chicago Edition CitationFry, Ron; Author. The Great Big Book of Personal Productivity. New Delhi, Viva Books Private Ltd, 2003.
Cita MLAFry, Ron; Author. The Great Big Book of Personal Productivity. 2003.
Atenció: Aquestes cites poden no estar 100% correctes.