Gaya APA
BUTTLE, F. (2007).
Customer Relationship Management = Manajemen Hubungan Pelanggan .
Malang:
Bayumedia Publishing.
Gaya MLA
BUTTLE, Francis.
"Customer Relationship Management = Manajemen Hubungan Pelanggan".
Malang:
Bayumedia Publishing,
2007.
Text.