Zemke, R. (1989). The service edge: 101 companies that profit customer care. Penguin.
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Dyfyniad Arddull Chicago
Zemke, Ron. The Service Edge: 101 Companies That Profit Customer Care. New York: Penguin, 1989.
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Dyfyniad MLA
Zemke, Ron. The Service Edge: 101 Companies That Profit Customer Care. Penguin, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.