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BARNES, James G.. (2003). Secrets of Customer Relationship Management (Cet. 1). Yogyakarta: Andi Offset.

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BARNES, James G.. Secrets of Customer Relationship Management. Cet. 1 Yogyakarta: Andi Offset, 2003. Text.

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BARNES, James G.. Secrets of Customer Relationship Management. Cet. 1 Yogyakarta: Andi Offset, 2003. Text.

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BARNES, James G.. Secrets of Customer Relationship Management. Cet. 1 Yogyakarta: Andi Offset, 2003. Print.