APA (7th ed.) Citation

Duncan, W. R., Jancar-Webster, B., & Switky, B. (2006). World politics in the 21st century (3rd ed.). Longman.

Chicago Style (17th ed.) Citation

Duncan, W. Raymond, Barbara Jancar-Webster, and Bob Switky. World Politics in the 21st Century. 3rd ed. New York: Longman, 2006.

MLA (9th ed.) Citation

Duncan, W. Raymond, et al. World Politics in the 21st Century. 3rd ed. Longman, 2006.