Wilken, S., & Villiers, T. (2002). Wilken and Villiers the law of waiver, variation, and estoppel (2nd ed.). Oxford University Press.
芝加哥风格引文Wilken, Sean, 与 Theresa Villiers. Wilken and Villiers the Law of Waiver, Variation, and Estoppel. 2nd ed. London ; New York: Oxford University Press, 2002.
MLA引文Wilken, Sean, 与 Theresa Villiers. Wilken and Villiers the Law of Waiver, Variation, and Estoppel. 2nd ed. Oxford University Press, 2002.
警告：这些引文格式不一定是100％准确.