Gaya APA

Buttle, F. (2004). Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concepts and Tools . Amsterdam: Elsevier Butter Worth Henemann.

Gaya MLA

Buttle, Francis. "Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concepts and Tools". Amsterdam: Elsevier Butter Worth Henemann, 2004. Text.