Contracts : cases and materials / by E. Allan Farnsworth (Late Alfred McCormack Professor of Law, Columbia University), Carol Sanger (Barbara Aronstein Black Professor of Law, Columbia University), Neil B. Cohen (Jeffrey D. Forchelli Professor of Law, Brooklyn Law School), Richard R.W. Brooks (Charles Keller Beekman Professor of Law, Columbia Law School), Larry T. Garvin (Lawrence D. Stanley Professor of Law, Ohio State University)