Portney, K. E. (1986). Approaching public policy analysis: An introduction to policy and program research. Prentice-Hall.
Chicago-viite (17. p.)Portney, Kent E. Approaching Public Policy Analysis: An Introduction to Policy and Program Research. Englewood Cliffs, N.J: Prentice-Hall, 1986.
MLA-viite (9. p.)Portney, Kent E. Approaching Public Policy Analysis: An Introduction to Policy and Program Research. Prentice-Hall, 1986.
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