Dyfyniad APA

Weimer, D. L., & Vining, A. R. (2005). Policy analysis: Concepts and practice (4th ed.). Pearson/Prentice-Hall.

Dyfyniad Arddull Chicago

Weimer, David L., and Aidan R. Vining. Policy Analysis: Concepts and Practice. 4th ed. Upper Saddle River, N.J: Pearson/Prentice-Hall, 2005.

Dyfyniad MLA

Weimer, David L., and Aidan R. Vining. Policy Analysis: Concepts and Practice. 4th ed. Pearson/Prentice-Hall, 2005.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.