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Dyfyniad Arddull ChicagoWind,Jerry. Digital Marketing: Global Strategies from the World's Leading Experts. New York: John Wiley & Sons, 2001.
Dyfyniad MLAWind,Jerry. Digital Marketing: Global Strategies from the World's Leading Experts. John Wiley & Sons, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.