Greenberg, P. (2004). CRM at the Speed of Light (3rd.). Tata Mcgraw Hill pub. co.
Chicago Style aipamenaGreenberg, Paul. CRM at the Speed of Light. 3rd. New Dehli: Tata Mcgraw Hill pub. co, 2004.
MLA aipamenaGreenberg, Paul. CRM at the Speed of Light. 3rd. Tata Mcgraw Hill pub. co, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.