APA-referens (7:e uppl.)

Hayes, P. (1936). Pope Pius XI. National Council of Catholic Men.

Chicago-referens (17:e uppl.)

Hayes, Patrick. Pope Pius XI. Washington, D.C.: National Council of Catholic Men, 1936.

MLA-referens (8:e uppl.)

Hayes, Patrick. Pope Pius XI. National Council of Catholic Men, 1936.