^Orrell, David; Chlupatý, Roman. The Evolution of Money. New York: Columbia University Press. 14 June 2016: 27 [31 March 2023]. ISBN 9780231541671. The Romans had enormous respect for property, especially land and slaves (which were the two most economically important kinds), and much of their legal system was devoted to defining and protecting ownership. [...] [A]ccording to sociologist Orlando Patterson, [...] Roman property law is based on the ownership of slaves.
^Makdisi, John. Islamic Property Law: Cases and Materials for Comparative Analysis with the Common Law. Carolina Academic Press. 2005. ISBN 1-59460-110-0.