John XXIII, P. (1965). Encyclicals of Pope John XXIII. National Catholic Welfare Conference.
Lua i Stíl Chicago (17ú heag.)John XXIII, Pope. Encyclicals of Pope John XXIII. Washington: National Catholic Welfare Conference, 1965.
Lua MLA (8ú heag.)John XXIII, Pope. Encyclicals of Pope John XXIII. National Catholic Welfare Conference, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.