Barker, E. (1951). Essay on Government (2nd.). Clarendon Press.
Lua i Stíl Chicago (17ú heag.)Barker, Ernest. Essay on Government. 2nd. Oxford: Clarendon Press, 1951.
Lua MLA (9ú heag.)Barker, Ernest. Essay on Government. 2nd. Clarendon Press, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.