O'Connor, K., & Sabato, L. (1993). American government: Roots and reform (Special pre-election preview ed., Special preview ed.). Macmillan Maxwell Macmillan Canada.
Lua i Stíl Chicago (17ú heag.)O'Connor, Karen, agus Larry Sabato. American Government: Roots and Reform. Special pre-election preview ed., Special preview ed. New York, Toronto: Macmillan Maxwell Macmillan Canada, 1993.
Lua MLA (9ú heag.)O'Connor, Karen, agus Larry Sabato. American Government: Roots and Reform. Special pre-election preview ed., Special preview ed. Macmillan Maxwell Macmillan Canada, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.