Cita APA (7th ed.)
Duxbury, R. (2008). Contract law. Sweet & maxwell.
Cita Chicago (17th ed.)
Duxbury, Robert. Contract Law. London: Sweet & maxwell, 2008.
Cita MLA (9th ed.)
Duxbury, Robert. Contract Law. Sweet & maxwell, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.