Lucas, Robert W., author
Customer service : building successful skills for the twenty-first century
McGraw-Hill, 2005
 Buku Teks
Lucas, Robert W., author
Customer service : skills for success
McGrow-Hill, 2015
 Buku Teks
Kamin, Maxine, author
10 steps to successful customer service
American Society for Training & Development, 2010
 eBooks
Kasmir, author
Etika customer service
RajaGrafindo Persada, 2005
 Buku Teks
Kasmir, author
Etika customer service / Kasmir
RajaGrafindo Persada, 2005
 Buku Teks
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