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The Loyalty Effect. Frederick F Reichheld. Harvard Business School Press . 1996
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Marketing Encyclopedia. Sybil F Stershic. American Marketing Association,NTC Business Books . 1996
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“员工忠诚已经消亡?”. Dinna Dayao. 世界经理人文摘 . 1997
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The Loyalty Effect. F. F. Reichheld. . 1996