Gaya APA

Birkland, T, A. (2015). An Introduction to the Policy Process: Theories, Concepts, and Models of Public Policy Making (3). New York: routledge.

Gaya MLA

Birkland, Thomas, A.. "An Introduction to the Policy Process: Theories, Concepts, and Models of Public Policy Making". 3 New York: routledge, 2015. Text.