Cita APA (7a ed.)

Knapp, C. L., Crystal, N. M., & Prince, H. G. (2012). Problems in contract law: Cases and materials (7th ed.). Wolters Kluwer Law & Business.

Cita Chicago Style (17a ed.)

Knapp, Charles L., Nathan M. Crystal, y Harry G. Prince. Problems in Contract Law: Cases and Materials. 7th ed. New York: Wolters Kluwer Law & Business, 2012.

Cita MLA (9a ed.)

Knapp, Charles L., et al. Problems in Contract Law: Cases and Materials. 7th ed. Wolters Kluwer Law & Business, 2012.