APA (7th ed.) Zitazioa

Brenkert, G. G. (1991). Political freedom. Routledge.

Chicago Style (17th ed.) Zitazioa

Brenkert, George G. Political Freedom. London: Routledge, 1991.

MLA (9th ed.) Zitazioa

Brenkert, George G. Political Freedom. Routledge, 1991.