Reichheld, Frederick F. The ultimate question : driving good profits and true growth / Fred Reichheld. - Boston, Mass. : Harvard Business School Press, c2006. - xi, 211 p. : ill. ; 25 cm. ISBN: 1591397839 9781591397830 LCCN: 2005025733 LC Class. No.: HF5415.5 .R439 2006 / .R439 2006 Dewey Class. No.: 658.15/54