Hanan, M. (2011). Consultative selling: The Hanan formula for high-margin sales at high levels (8th ed.). American Management Association.
Chicago-Zitierstil (17. Ausg.)Hanan, Mack. Consultative Selling: The Hanan Formula for High-margin Sales at High Levels. 8th ed. New York: American Management Association, 2011.
MLA-Zitierstil (9. Ausg.)Hanan, Mack. Consultative Selling: The Hanan Formula for High-margin Sales at High Levels. 8th ed. American Management Association, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.