John XXIII, P. (1965). Encyclicals of Pope John XXIII. National Catholic Welfare Conference.
Chicago-referens (17:e uppl.)John XXIII, Pope. Encyclicals of Pope John XXIII. Washington: National Catholic Welfare Conference, 1965.
MLA-referens (8:e uppl.)John XXIII, Pope. Encyclicals of Pope John XXIII. National Catholic Welfare Conference, 1965.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.