Dye, T. R. (1995). Understanding public policy (8th ed.). Englewood Cliffs, N.J.: Prentice Hall.
Dyfyniad Arddull ChicagoDye, Thomas R. Understanding Public Policy. 8th ed. Englewood Cliffs, N.J.: Prentice Hall, 1995.
Dyfyniad MLADye, Thomas R. Understanding Public Policy. 8th ed. Englewood Cliffs, N.J.: Prentice Hall, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.