Gaya APA
Buttle, F. (2007).
Customer relationship management : concepts and tools = Manajemen hubungan pelanggan (1).
Malang:
Bayumedia.
Gaya MLA
Buttle, Francis.
"Customer relationship management : concepts and tools = Manajemen hubungan pelanggan".
1
Malang:
Bayumedia,
2007.
Text.