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Dyfyniad Arddull ChicagoFarese, Lois Schneider. Marketing Essentials. Boston: McGraw-Hill Higher Education, 2003.
Dyfyniad MLAFarese, Lois Schneider. Marketing Essentials. Boston: McGraw-Hill Higher Education, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.