Reichheld, F. F. (1996). The loyalty effect: The hidden force behind growth, profits, and lasting value. Harvard Business School Press.
Chicago-Zitierstil (17. Ausg.)Reichheld, Frederick F. The Loyalty Effect: The Hidden Force Behind Growth, Profits, and Lasting Value. Boston, Mass: Harvard Business School Press, 1996.
MLA-Zitierstil (9. Ausg.)Reichheld, Frederick F. The Loyalty Effect: The Hidden Force Behind Growth, Profits, and Lasting Value. Harvard Business School Press, 1996.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.