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Dyfyniad Arddull ChicagoEulau, Heinz. The Behavioral Persuasion in Politics. New York: Random House, 1963.
Dyfyniad MLAEulau, Heinz. The Behavioral Persuasion in Politics. Random House, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.