Gaya APA
BUTTLE, F.
(2004).
Customer Relationship Management : Manajemen Hubungan
(
1)
.
Malang:
Bayumedia.
Gaya MLA
BUTTLE, FRANCIS.
"Customer Relationship Management : Manajemen Hubungan".
1
Malang:
Bayumedia,
2004.
Text.