Gaya APA
Buttle, F. (2007).
Customer Relationship Management (Managemen Hubungan Pelanggan) : Concepts and Tools (1).
Malang:
Bayumedia.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management (Managemen Hubungan Pelanggan) : Concepts and Tools".
1
Malang:
Bayumedia,
2007.
Text.