Cita APA (7a ed.)

Frey, M. A., & Frey, P. H. (2001). Essentials of contract law. West/Thomson Learning.

Cita Chicago Style (17a ed.)

Frey, Martin A., y Phyllis Hurley Frey. Essentials of Contract Law. Albany, NY: West/Thomson Learning, 2001.

Cita MLA (9a ed.)

Frey, Martin A., y Phyllis Hurley Frey. Essentials of Contract Law. West/Thomson Learning, 2001.