APA استشهاد

O'Sullivan, J., & Hilliard, J. (2014). The law of contract (6th ed.). Oxford University Press.

استشهاد بنمط شيكاغو

O'Sullivan, Janet, و Jonathan Hilliard. The Law of Contract. 6th ed. New York: Oxford University Press, 2014.

MLA استشهاد

O'Sullivan, Janet, و Jonathan Hilliard. The Law of Contract. 6th ed. Oxford University Press, 2014.