Lucas, Robert W., author
Customer service
[publisher not identified], [date of publication not identified]
 Buku Teks
Kasmir, author
Etika customer service / Kasmir
RajaGrafindo Persada, 2005
 Buku Teks
Kasmir, author
Etika customer service
RajaGrafindo Persada, 2005
 Buku Teks
Lucas, Robert W., author
Customer service : skills for success
McGrow-Hill, 2015
 Buku Teks
Delvin, Kimberly, author
Customer service training
ATD Press, 2015
 Buku Teks
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