Gaya APA
Buttle,Francis, . ().
Custumer relationship management : Manajemen hubungan pelanggan consepts and tool (Ed.1).
Malang:
Bayumedia.
Gaya MLA
Buttle,Francis, .
"Custumer relationship management : Manajemen hubungan pelanggan consepts and tool".
Ed.1
Malang:
Bayumedia,
.
Textbook.