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Dyfyniad Arddull ChicagoPersuasive Communication Campaigns/ Michael Pfau And Roxanne Parrott. Allyn and Bacon, 1993.
Dyfyniad MLAPersuasive Communication Campaigns/ Michael Pfau And Roxanne Parrott. Allyn and Bacon, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.