Cita APA (7a ed.)

Richards, P. (2007). Law of contract (8th. ed.). Pearson.

Cita Chicago Style (17a ed.)

Richards, Paul. Law of Contract. 8th. ed. Harlow: Pearson, 2007.

Cita MLA (8a ed.)

Richards, Paul. Law of Contract. 8th. ed. Pearson, 2007.