APA

Kelly J. N. D., . (1986). The Oxford Dictionary of Popes. New York: Oxford University Press.

Chicago

Kelly J N D, . 1986. The Oxford Dictionary of Popes. New York: Oxford University Press.

Harvard

Kelly J. N. D., . (1986). The Oxford Dictionary of Popes. New York: Oxford University Press.

MLA

Kelly J N D, . The Oxford Dictionary of Popes. New York: Oxford University Press. 1986.