Gaya APA
Buttle, F. (2004).
Customer Relationship Management (Manajemen Hubungan Pelanggan) Concept and Tools .
Malang:
Bayumedia Publishing.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management (Manajemen Hubungan Pelanggan) Concept and Tools".
Malang:
Bayumedia Publishing,
2004.
Texts.