Roberts, R. R., & Kraynak, J. (2008). Walk like a giant, sell like a madman: America's #1 salesman shows you how to sell anything! (2nd ed.). John Wiley & Sons.
Chicago-Zitierstil (17. Ausg.)Roberts, Ralph R., und Joe Kraynak. Walk like a Giant, Sell like a Madman: America's #1 Salesman Shows You How to Sell Anything! 2nd ed. Hoboken, N.J: John Wiley & Sons, 2008.
MLA-Zitierstil (9. Ausg.)Roberts, Ralph R., und Joe Kraynak. Walk like a Giant, Sell like a Madman: America's #1 Salesman Shows You How to Sell Anything! 2nd ed. John Wiley & Sons, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.