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Dyfyniad Arddull ChicagoContemporary Services Marketing Management: A Reader. London: The Dryden Press, 1997.
Dyfyniad MLAContemporary Services Marketing Management: A Reader. London: The Dryden Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.