Gaya APA

BUTTEL, F. (2007). CUSTOMER RELATIONSHIP MANAGEMENT : MANAJEMEN HUBUNGAN PELANGGAN (Ed. 1). : BAYUMEDIA PUBLISHING.

Gaya MLA

BUTTEL, FRANCIS. "CUSTOMER RELATIONSHIP MANAGEMENT : MANAJEMEN HUBUNGAN PELANGGAN". Ed. 1 : BAYUMEDIA PUBLISHING, 2007. Text.