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Dyfyniad APA
DiJulius, J. R. (2003). Secret service: Hidden systems that deliver unforgettable customer service. AMACOM.
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Dyfyniad Arddull Chicago
DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. New York: AMACOM, 2003.
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Dyfyniad MLA
DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. AMACOM, 2003.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.