Gaya APA
BARNES, J, G., WINARDI, A, [.
(2003).
Secrets of customer relationship management
.
Yogyakarta:
Andi.
Gaya MLA
BARNES, James, G., WINARDI, Andreas, [penerj.].
"Secrets of customer relationship management".
Yogyakarta:
Andi,
2003.
Buku.