Schmidt, S. W., & Shelley, M. C. (1993). American government and politics today: The essentials (1993-1994 edition.). Thomson/Wadsworth, West Publishing.
Lua i Stíl Chicago (17ú heag.)Schmidt, Steffen W., agus Mack C. Shelley. American Government and Politics Today: The Essentials. 1993-1994 edition. Australia ; New York ; Belmont, CA: Thomson/Wadsworth, West Publishing, 1993.
Lua MLA (8ú heag.)Schmidt, Steffen W., agus Mack C. Shelley. American Government and Politics Today: The Essentials. 1993-1994 edition. Thomson/Wadsworth, West Publishing, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.