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