Cita APA (7a ed.)

Collins, H. (1993). The law of contract (2nd ed.). Butterworths.

Cita Chicago Style (17a ed.)

Collins, Hugh. The Law of Contract. 2nd ed. London [etc.]: Butterworths, 1993.

Cita MLA (9a ed.)

Collins, Hugh. The Law of Contract. 2nd ed. Butterworths, 1993.