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Dyfyniad Arddull ChicagoHarris, Thomas L. The Marketers's Guide to Public Relation in the 21st Century. Mason, OH: Thomson Higher Education, 2006.
Dyfyniad MLAHarris, Thomas L. The Marketers's Guide to Public Relation in the 21st Century. Mason, OH: Thomson Higher Education, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.