APA

Knapp C. L., Crystal N. M. & Prince H. G. (2009). Rules of contract law: selections from the Uniform commercial code, the CISG, the Restatement (second) of contracts and the UNIDROIT principles, with material on contract drafting and sample examination questions. New York: Aspen Publishers.

Chicago

Knapp Charles L, Crystal Nathan M and Prince Harry G. 2009. Rules of contract law: selections from the Uniform commercial code, the CISG, the Restatement (second) of contracts and the UNIDROIT principles, with material on contract drafting and sample examination questions. New York: Aspen Publishers.

Harvard

Knapp C. L., Crystal N. M. and Prince H. G. (2009). Rules of contract law: selections from the Uniform commercial code, the CISG, the Restatement (second) of contracts and the UNIDROIT principles, with material on contract drafting and sample examination questions. New York: Aspen Publishers.

MLA

Knapp Charles L, Crystal Nathan M and Prince Harry G. Rules of contract law: selections from the Uniform commercial code, the CISG, the Restatement (second) of contracts and the UNIDROIT principles, with material on contract drafting and sample examination questions. New York: Aspen Publishers. 2009.