Duxbury, Robert. Contract Law. Sweet & Maxwell, 2006.
Friedman, Stephen E. "Improving the Rolling Contract." American University Law Review, vol. 56, no. 1, 2006, pp. 1-50, digitalcommons.wcl.american.edu/aulr/vol56/iss1/6.
Robertson, Andrew. "The Limits of Voluntariness in Contracts." Melbourne University Law Review, vol. 29, 2005, pp. 179-217, law.unimelb.edu.au/__data/assets/pdf_file/0005/1708016/29_1_5.pdf.
Karambelas, Nicholas. "International Transactions and the Law." Washington Lawyer, Apr. 2009, pp. 261-35, www.dcbar.org/bar-resources/publications/washington-lawyer/articles/april-2009-international-transactions.cfm.