Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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