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Dyfyniad Arddull ChicagoWilliams, J.D. Public Administration: The People's Business. Boston: Little, Brown, 1980.
Dyfyniad MLAWilliams, J.D. Public Administration: The People's Business. Little, Brown, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.