Gaya APA

buttle, F. (2007). Customer Relationship Management (Manajemen Hubungan Pelanggan) : Concept and Tools . Malang: Elsevier Ltd..

Gaya MLA

buttle, Francis. "Customer Relationship Management (Manajemen Hubungan Pelanggan) : Concept and Tools". Malang: Elsevier Ltd., 2007. Text.