Benn, S. I., & Peters, R. S. (1965). The principles of political thought. Free Press.
Lua i Stíl Chicago (17ú heag.)Benn, Stanley I., agus Richard Stanley Peters. The Principles of Political Thought. New York: Free Press, 1965.
Lua MLA (9ú heag.)Benn, Stanley I., agus Richard Stanley Peters. The Principles of Political Thought. Free Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.