Greenberg, P. (2001). CRM at the speed of light: Capturing and keeping customers in internet real time. TMH.
Lua i Stíl Chicago (17ú heag.)Greenberg, Paul. CRM at the Speed of Light: Capturing and Keeping Customers in Internet Real Time. New delhi: TMH, 2001.
Lua MLA (9ú heag.)Greenberg, Paul. CRM at the Speed of Light: Capturing and Keeping Customers in Internet Real Time. TMH, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.