Gaya APA
Buttle, F. (2007).
Customer Relationship Management Manajemen Hubungan Pelanggan Concept and Tools .
Malang:
Bayu Media.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management Manajemen Hubungan Pelanggan Concept and Tools".
Malang:
Bayu Media,
2007.
Text.