Roberts-Phelps, G. (2001). Customer relationship management: How to turn a good business into a great one! Hawksmere.
Chicago-Zitierstil (17. Ausg.)Roberts-Phelps, Graham. Customer Relationship Management: How to Turn a Good Business into a Great One! London: Hawksmere, 2001.
MLA-Zitierstil (9. Ausg.)Roberts-Phelps, Graham. Customer Relationship Management: How to Turn a Good Business into a Great One! Hawksmere, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.