Gaya APA
Buttle, F. (2007).
Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concepts and Tools .
Malang:
Bayumedia Publishing.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concepts and Tools".
Malang:
Bayumedia Publishing,
2007.
Text.