Cita APA (7th ed.)
Summers, R. S., & Hillman, R. A. (2011). Contract and related obligation: Theory, doctrine, and practice (6th ed.). Thomson/West.
Cita Chicago (17th ed.)
Summers, Robert S., i Robert A. Hillman. Contract and Related Obligation: Theory, Doctrine, and Practice. 6th ed. St. Paul, MN: Thomson/West, 2011.
Cita MLA (9th ed.)
Summers, Robert S., i Robert A. Hillman. Contract and Related Obligation: Theory, Doctrine, and Practice. 6th ed. Thomson/West, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.