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Pelanggan adalah raja : satu panduan praktikal bagi mendapatkan nilai yang lebih daripada apa yang anda bayar / John Tschohl.

by Tschohl, John
Published 1998

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E-service : speed,technology and price built around service / John Tschohl.

by Tschohl, John
Published 2001

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Loyal for life : how to take unhappy customers form hell to heaven in 60 seconds or less / John Tschohl.

by Tschohl, John
Published 2006

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Empowerment : a way of life / John Tschohl.

by Tschohl, John
Published 2010

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Achieving excellence through customer service / John Tschohl.

by Tschohl, John
Published 1996