Kean, D. (2008). How to win friends and influence profits: The art of winning more business from your clients. Marshall Cavendish Business.
Chicago-Zitierstil (17. Ausg.)Kean, David. How to Win Friends and Influence Profits: The Art of Winning More Business from Your Clients. London: Marshall Cavendish Business, 2008.
MLA-Zitierstil (9. Ausg.)Kean, David. How to Win Friends and Influence Profits: The Art of Winning More Business from Your Clients. Marshall Cavendish Business, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.