Gaya APA
Buttle, F. et al (2007).
Customer relationship management (manajemen hubungan pelanggan): concepts and tools .
Jakarta:
Bayumedia Publishing.
Gaya MLA
Buttle, Francis. et al.
"Customer relationship management (manajemen hubungan pelanggan): concepts and tools".
Jakarta:
Bayumedia Publishing,
2007.
Text.