Gaya APA
Buttle, F. (2007).
Customer Relationship Management = Manajemen Hubungan Pelanggan : concepts and tools .
Amsterdam:
Elsevier.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management = Manajemen Hubungan Pelanggan : concepts and tools".
Amsterdam:
Elsevier,
2007.
Text.