Sewell, C. (2009). Khách hàng trọn đời =: Customer for life. Thành phố Hồ Chí Minh: Trẻ.
শিকাগো স্টাইলে সাইটেশনSewell, Carl. Khách Hàng Trọn đời =: Customer for Life. Thành phố Hồ Chí Minh: Trẻ, 2009.
এমএলএ সাইটেশনSewell, Carl. Khách Hàng Trọn đời =: Customer for Life. Thành phố Hồ Chí Minh: Trẻ, 2009.
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