Lucas, Robert W.
Customer service : building successful skills for the twenty-first century
McGraw-Hill, 2005
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Lucas, Robert W.
Customer service : skills for success
McGrow-Hill, 2015
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Kasmir
Etika customer service / Kasmir
RajaGrafindo Persada, 2005
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Kasmir
Etika customer service
RajaGrafindo Persada, 2005
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Harris, Elaine K
Customer service : a practical approach / Elaine K. Harris
Pearson , 2013
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