Problems in Contract Law: Cases and Materials, Ninth Edition
Charles L. Knapp, Nathan M. Crystal, Harry G. Prince
and
Rules of Contract Law, 2019-2020: Selections from the Uniform Commercial Code, the CISG, the Restatement (Second) of Contracts, and the UNIDROIT Principles, with Material on Contract Drafting, Sample Examination Questions, and Supplemental CISG Cases
Charles L. Knapp, Nathan M. Crystal, Harry G. Prince