Paton, G. W., & Derham, D. P. (1972). A textbook of jurisprudence (4th ed.). Clarendon Press.

Paton, G. W., and David P. Derham. A Textbook of Jurisprudence. 4th ed. Oxford: Clarendon Press, 1972.

Paton, G. W., and David P. Derham. A Textbook of Jurisprudence. 4th ed. Clarendon Press, 1972.