Buttle, francais
Customer relationship management: concepts and technologies
Elsevier/Butterworth-Heinemann, 2009
 Buku Teks SO
Henry Vienayoko
Customer relationship management, kepuasan dan loyalitas pelanggan DHL Worldwide Express
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
 UI - Tesis Membership
Barnes, James G.
Secrets of customer relationship management =​ Rahasia manajemen hubungan pelanggan
Andi, 2003
 Buku Teks SO
Harvard business review on customer relationship management
Harvard Business School Publication, 2001
 Buku Teks SO
Dyche`, Jill
The CRM handbook : a business guide to customer relationship management
Addison-Wesley, 2002
 Buku Referensi