Birkland Thomas A. (2020). Introduction to the policy process: Theories, concepts, and models of public policy making (5th ed.). Routledge (Taylor and Francis).

Birkland Thomas A. Introduction to the Policy Process: Theories, Concepts, and Models of Public Policy Making. 5th ed. New York: Routledge (Taylor and Francis), 2020.

Birkland Thomas A. Introduction to the Policy Process: Theories, Concepts, and Models of Public Policy Making. 5th ed. Routledge (Taylor and Francis), 2020.