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Dyfyniad Arddull ChicagoHenry, Nicholas. Public Administration and Public Affairs. 10th ed. Upper Saddle River, N.J: Pearson/Prentice Hall, 2007.
Dyfyniad MLAHenry, Nicholas. Public Administration and Public Affairs. 10th ed. Pearson/Prentice Hall, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.