Gaya APA
Buttle, F. (2007).
Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concept and Tolls .
Amsterdam:
Elsevier.
Gaya MLA
Buttle, Francis.
"Customer Relationship Management ( Manajemen Hubungan Pelanggan ) Concept and Tolls".
Amsterdam:
Elsevier,
2007.
Text.