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Dyfyniad Arddull ChicagoMartin, Dick. Secrets of the Marketing Masters. Newyork: AMACOM, 2009.
Dyfyniad MLAMartin, Dick. Secrets of the Marketing Masters. AMACOM, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.