Heywood, A. (2007). Politics (3rd ed.). Palgrave.
Lua i Stíl Chicago (17ú heag.)Heywood, Andrew. Politics. 3rd ed. New York: Palgrave, 2007.
Lua MLA (9ú heag.)Heywood, Andrew. Politics. 3rd ed. Palgrave, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.