Helen Dwight Reid Educational Foundation. (1990). Perspectives on political science. Heldref Publications.
Lua i Stíl Chicago (17ú heag.)Helen Dwight Reid Educational Foundation. Perspectives on Political Science. Washington, D.C.: Heldref Publications, 1990.
Lua MLA (9ú heag.)Helen Dwight Reid Educational Foundation. Perspectives on Political Science. Heldref Publications, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.