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Dyfyniad Arddull ChicagoMcKean. Managing Customers Through Ecocnomic Cycles. Sussex: John Wiley & Sons, 2010.
Dyfyniad MLAMcKean. Managing Customers Through Ecocnomic Cycles. John Wiley & Sons, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.