Cita APA (7th ed.)

Frey, M. A., Bitting, T. H., & Frey, P. H. (1993). Introduction to contracts and restitution (Second edition.). West Pub. Co.

Cita Chicago (17th ed.)

Frey, Martin A., Terry H. Bitting, i Phyllis Hurley Frey. Introduction to Contracts and Restitution. Second edition. Minneapolis/St. Paul: West Pub. Co, 1993.

Cita MLA (9th ed.)

Frey, Martin A., et al. Introduction to Contracts and Restitution. Second edition. West Pub. Co, 1993.