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
Harris, Elaine K
Customer service : a practical approach / Elaine K. Harris
Pearson , 2013
 Buku Teks
Gallagher, Richard S.
The customer service survival kit: what to say to defuse even the worst customer situations
[American Management Association, ], 2013
 eBooks