APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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