APA-referens (7:e uppl.)

Schmidt, T. V. (1981). A guide to the encyclicals of the Roman pontiffs from Pius XII to Paul VI (1939-1978). Catholic University of America.

Chicago-referens (17:e uppl.)

Schmidt, Thomas V. A Guide to the Encyclicals of the Roman Pontiffs from Pius XII to Paul VI (1939-1978). Washington, D.C.: Catholic University of America, 1981.

MLA-referens (8:e uppl.)

Schmidt, Thomas V. A Guide to the Encyclicals of the Roman Pontiffs from Pius XII to Paul VI (1939-1978). Catholic University of America, 1981.