APA (7th ed.) Zitazioa

Howlett, M., Ramesh, M., & Perl, A. (2020). Studying public policy: Policy cycles and policy subsystems (4th ed.). Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Howlett, Michael, M. Ramesh, eta Anthony Perl. Studying Public Policy: Policy Cycles and Policy Subsystems. 4th ed. Don Mills, Ontario: Oxford University Press, 2020.

MLA (9th ed.) Zitazioa

Howlett, Michael, et al. Studying Public Policy: Policy Cycles and Policy Subsystems. 4th ed. Oxford University Press, 2020.