Duncan, W. R., Jancar-Webster, B., & Switky, B. (2001). World politics in the 21st century. Longman.
芝加哥风格引文Duncan, W. Raymond, Barbara Jancar-Webster, 与 Bob Switky. World Politics in the 21st Century. New York: Longman, 2001.
MLA引文Duncan, W. Raymond, et al. World Politics in the 21st Century. Longman, 2001.
警告：这些引文格式不一定是100％准确.