Cita APA (7a ed.)

Wilken, S., & Villiers, T. (2002). Wilken and Villiers the law of waiver, variation, and estoppel (2nd ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Wilken, Sean, y Theresa Villiers. Wilken and Villiers the Law of Waiver, Variation, and Estoppel. 2nd ed. London ; New York: Oxford University Press, 2002.

Cita MLA (9a ed.)

Wilken, Sean, y Theresa Villiers. Wilken and Villiers the Law of Waiver, Variation, and Estoppel. 2nd ed. Oxford University Press, 2002.