Bella Chip R. & Zebke Ron. (2007). Managing Knock Your Socks off Service. American Management Association.
Chicago Style (17. basım) AtıfBella Chip R. ve Zebke Ron. Managing Knock Your Socks off Service. NewYork: American Management Association, 2007.
MLA (9th ed.) AtıfBella Chip R. ve Zebke Ron. Managing Knock Your Socks off Service. American Management Association, 2007.
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