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Dyfyniad Arddull ChicagoRowland, Howard Ray. Effective Community Relations. San Francisco: Jossey-Bass, 1980.
Dyfyniad MLARowland, Howard Ray. Effective Community Relations. Jossey-Bass, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.