Cita APA (7th ed.)

Frey, M. A., & Frey, P. H. (2008). Introduction to the law of contracts (4th ed.). Thomson Delmar Learning.

Cita Chicago (17th ed.)

Frey, Martin A., i Phyllis Hurley Frey. Introduction to the Law of Contracts. 4th ed. Clifton Park, N.Y: Thomson Delmar Learning, 2008.

Cita MLA (9th ed.)

Frey, Martin A., i Phyllis Hurley Frey. Introduction to the Law of Contracts. 4th ed. Thomson Delmar Learning, 2008.