Cita APA (7a ed.)

Ruff, A. R. (2005). Contract law (4rd ed.). Sweet & Maxwell.

Cita Chicago Style (17a ed.)

Ruff, Anne R. Contract Law. 4rd ed. London: Sweet & Maxwell, 2005.

Cita MLA (9a ed.)

Ruff, Anne R. Contract Law. 4rd ed. Sweet & Maxwell, 2005.