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Dyfyniad Arddull Chicago.Dunn, William N. Public Policy Analysis: An Introduction. Englewood Cliffs, N.J.: Prentice-Hall, 1981.
Dyfyniad MLA.Dunn, William N. Public Policy Analysis: An Introduction. Prentice-Hall, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.