APA (7th ed.) Citation

Kelly, J. N. D., & Walsh, M. J. (2010). The Oxford dictionary of popes (2nd ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Kelly, J. N. D., and Michael J. Walsh. The Oxford Dictionary of Popes. 2nd ed. New York: Oxford University Press, 2010.

MLA (9th ed.) Citation

Kelly, J. N. D., and Michael J. Walsh. The Oxford Dictionary of Popes. 2nd ed. Oxford University Press, 2010.