APA

Loomis L. R., . (1965). The book of the popes: to the pontificate of Gregory I. New York: Octagon Books, Inc.

Chicago

Loomis Louise Ropes, . 1965. The book of the popes: to the pontificate of Gregory I. New York: Octagon Books, Inc.

Harvard

Loomis L. R., . (1965). The book of the popes: to the pontificate of Gregory I. New York: Octagon Books, Inc.

MLA

Loomis Louise Ropes, . The book of the popes: to the pontificate of Gregory I. New York: Octagon Books, Inc. 1965.