APA (7th ed.) Citation

Duncan, W. R., Jancar-Webster, B., & Switky, B. (2001). World politics in the 21st century. Longman.

Chicago Style (17th ed.) Citation

Duncan, W. Raymond, Barbara Jancar-Webster, and Bob Switky. World Politics in the 21st Century. New York: Longman, 2001.

MLA (9th ed.) Citation

Duncan, W. Raymond, et al. World Politics in the 21st Century. Longman, 2001.