Muchlis Sobana
Analisis kualitas pelayanan dengan pendekatan Service Triangle di PT. Thames PAM Jaya Customer Center Pulomas
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
 UI - Tesis Membership
Lucas, Robert W.
Customer service : skills for success
McGrow-Hill, 2015
 Buku Teks
Kasmir
Etika customer service / Kasmir
RajaGrafindo Persada, 2005
 Buku Teks
Kasmir
Etika customer service
RajaGrafindo Persada, 2005
 Buku Teks
Kamin, Maxine
10 steps to successful customer service
American Society for Training & Development, 2010
 eBooks