Yang Kai. (2008). Voice of the Customer: Capture and Analysis. U.S.A: MC Graw Hill.
Trích dẫn kiểu ChicagoYang Kai. Voice of the Customer: Capture and Analysis. U.S.A: MC Graw Hill, 2008.
Deismireacht MLAYang Kai. Voice of the Customer: Capture and Analysis. U.S.A: MC Graw Hill, 2008.
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