Cita APA (7a ed.)

Collins, H. (1997). The law of contract (3rd ed.). Butterworths.

Cita Chicago Style (17a ed.)

Collins, Hugh. The Law of Contract. 3rd ed. London [etc.]: Butterworths, 1997.

Cita MLA (9a ed.)

Collins, Hugh. The Law of Contract. 3rd ed. Butterworths, 1997.