APA

Burton Katherine, . (1962). Leo the Thirteenth: the first modern pope. New York: D. McKay Co.

Chicago

Burton Katherine, . 1962. Leo the Thirteenth: the first modern pope. New York: D. McKay Co.

Harvard

Burton Katherine, . (1962). Leo the Thirteenth: the first modern pope. New York: D. McKay Co.

MLA

Burton Katherine, . Leo the Thirteenth: the first modern pope. New York: D. McKay Co. 1962.