APA (7th ed.) Citation

O'Connor, K., Sabato, L., & Yanus, A. B. (2011). Essentials of American government: Roots and reform (2011 ed.). Longman.

Chicago Style (17th ed.) Citation

O'Connor, Karen, Larry Sabato, and Alixandra B. Yanus. Essentials of American Government: Roots and Reform. 2011 ed. Boston ; Munich u.a: Longman, 2011.

MLA (9th ed.) Citation

O'Connor, Karen, et al. Essentials of American Government: Roots and Reform. 2011 ed. Longman, 2011.