Greenberg, P. (2001). CRM at the speed of light: Capturing and keeping customers in internet real time. TMH.
Chicago-referens (17:e uppl.)Greenberg, Paul. CRM at the Speed of Light: Capturing and Keeping Customers in Internet Real Time. New delhi: TMH, 2001.
MLA-referens (9:e uppl.)Greenberg, Paul. CRM at the Speed of Light: Capturing and Keeping Customers in Internet Real Time. TMH, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.