APA-referens (7:e uppl.)

Pius, P. C. C. P. (1932). Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C..

Chicago-referens (17:e uppl.)

Pius, Pope; Catholic Church. Pope. Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1932.

MLA-referens (8:e uppl.)

Pius, Pope; Catholic Church. Pope. Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1932.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.