Cita APA (7th ed.)

Villiers, T., & Wilken, S. (1998). Waiver, variation, and estoppel. J. Wiley.

Cita Chicago (17th ed.)

Villiers, Theresa, i Sean Wilken. Waiver, Variation, and Estoppel. New York: J. Wiley, 1998.

Cita MLA (9th ed.)

Villiers, Theresa, i Sean Wilken. Waiver, Variation, and Estoppel. J. Wiley, 1998.