Hardy, D. (2010). The Compound effect: Multiplying your success, one simple step at a time. Success Books.
Chicago-Zitierstil (17. Ausg.)Hardy, Darren. The Compound Effect: Multiplying Your Success, One Simple Step at a Time. Lake Dallas, Texas: Success Books, 2010.
MLA-Zitierstil (9. Ausg.)Hardy, Darren. The Compound Effect: Multiplying Your Success, One Simple Step at a Time. Success Books, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.