Gaya APA
Tunggal,Ak.MBA, D, A, W. (2000).
Konsep Dasar Customer Relationship Management (CRM) .
Jakarta:
Harvarindo.
Gaya MLA
Tunggal,Ak.MBA, Drs., Amin, Widjaja.
"Konsep Dasar Customer Relationship Management (CRM)".
Jakarta:
Harvarindo,
2000.
Text.