Sabine, G. H., & Thorson, T. L. (1973). A history of political theory (4th ed.). Dryden Press, Oxford & IBH Publishing.
Lua i Stíl Chicago (17ú heag.)Sabine, George Holland, agus Thomas Landon Thorson. A History of Political Theory. 4th ed. Hinsdale, Ill. : New Delhi: Dryden Press, Oxford & IBH Publishing, 1973.
Lua MLA (8ú heag.)Sabine, George Holland, agus Thomas Landon Thorson. A History of Political Theory. 4th ed. Dryden Press, Oxford & IBH Publishing, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.