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Dyfyniad Arddull ChicagoBryant, Jenningings. Fundamental of Media Effects. New York: McGraw-Hill, 2002.
Dyfyniad MLABryant, Jenningings. Fundamental of Media Effects. New York: McGraw-Hill, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.