Lucas, Robert W., author
Customer service
[publisher not identified], [date of publication not identified]
 Buku Teks
Best practices in customer service
edited by Ron Zemke and John A. Woods
American Management Association, 1998
 eBooks
Anderson, Kristin, author
Great customer service on the telephone
American Management Association, 1992
 eBooks
Kasmir, author
Etika customer service
RajaGrafindo Persada, 2005
 Buku Teks
Lucas, Robert W., author
Customer service : skills for success
McGrow-Hill, 2015
 Buku Teks
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