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Dyfyniad Arddull ChicagoWeimer, David L., and Aidan R. Vining. Policy Analysis: Concepts and Practice. New Jersey: Prentice Hall, 1999.
Dyfyniad MLAWeimer, David L., and Aidan R. Vining. Policy Analysis: Concepts and Practice. Prentice Hall, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.