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Dyfyniad Arddull ChicagoHill, Michael J. The Public Policy Process. 6th ed. New York ; Harlow: Pearson, 2013.
Dyfyniad MLAHill, Michael J. The Public Policy Process. 6th ed. Pearson, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.