APA (7th ed.) Citation

O'Connor, K., & Sabato, L. (2009). American government: Roots and reform (2009 ed.). Pearson Longman.

Chicago Style (17th ed.) Citation

O'Connor, Karen, and Larry Sabato. American Government: Roots and Reform. 2009 ed. New York [u.a.]: Pearson Longman, 2009.

MLA (9th ed.) Citation

O'Connor, Karen, and Larry Sabato. American Government: Roots and Reform. 2009 ed. Pearson Longman, 2009.