Citazione Stile APA (7a Edizione)

Summers, R. S., & Hillman, R. A. (2011). Contract and related obligation: Theory, doctrine, and practice (6th ed.). Thomson/West.

Citazione stile Chigago Style (17a edizione)

Summers, Robert S., e Robert A. Hillman. Contract and Related Obligation: Theory, Doctrine, and Practice. 6th ed. St. Paul, MN: Thomson/West, 2011.

Citatione MLA (9a ed.)

Summers, Robert S., e Robert A. Hillman. Contract and Related Obligation: Theory, Doctrine, and Practice. 6th ed. Thomson/West, 2011.