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Kasmir, Dr, SE,. MM. (2011). Etika Customer Service (1). Jakarta: Raja Grapindo.

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Kasmir, Dr, SE,. MM. Etika Customer Service. 1 Jakarta: Raja Grapindo, 2011. Text.

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Kasmir, Dr, SE,. MM. Etika Customer Service. 1 Jakarta: Raja Grapindo, 2011. Text.

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Kasmir, Dr, SE,. MM. Etika Customer Service. 1 Jakarta: Raja Grapindo, 2011. Print.