Cita APA (7a ed.)

Richards, P. H. (2002). Law of contract (5th ed.). Longman.

Cita Chicago Style (17a ed.)

Richards, Paul H. Law of Contract. 5th ed. Harlow, Essex: Longman, 2002.

Cita MLA (9a ed.)

Richards, Paul H. Law of Contract. 5th ed. Longman, 2002.