Lucas, R. W. (2005). Customer service: Building successful skills for the twenty-first century (3. ed.). McGraw-Hill Irwin.
Chicago-Zitierstil (17. Ausg.)Lucas, Robert W. Customer Service: Building Successful Skills for the Twenty-first Century. 3. ed. Boston u.a: McGraw-Hill Irwin, 2005.
MLA-Zitierstil (9. Ausg.)Lucas, Robert W. Customer Service: Building Successful Skills for the Twenty-first Century. 3. ed. McGraw-Hill Irwin, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.