Cita APA (7th ed.)

Putt, A. D., & Springer, J. F. (1989). Policy research: Concepts, methods, and applications. Prentice Hall.

Cita Chicago (17th ed.)

Putt, Allen D., i J. Frederick Springer. Policy Research: Concepts, Methods, and Applications. Englewood Cliffs, N.J: Prentice Hall, 1989.

Cita MLA (9th ed.)

Putt, Allen D., i J. Frederick Springer. Policy Research: Concepts, Methods, and Applications. Prentice Hall, 1989.