APA-viite (7. p.)

Howlett, M., & M.Ramesh , A. P. (2020). Studying Public Policy: Principles and processes. (4 th ed.). Canada.

Chicago-viite (17. p.)

Howlett, Michael, ja Anthony Perl M.Ramesh. Studying Public Policy: Principles and Processes. 4 th ed. Oxford: Canada, 2020.

MLA-viite (9. p.)

Howlett, Michael, ja Anthony Perl M.Ramesh. Studying Public Policy: Principles and Processes. 4 th ed. Canada, 2020.