John XXIII, P. (1963). Apostolic constitution convoking the Second Vatican Ecumenical Council. National Catholic Welfare Conference.
Dyfyniad Arddull ChicagoJohn XXIII, Pope. Apostolic Constitution Convoking the Second Vatican Ecumenical Council. Washington: National Catholic Welfare Conference, 1963.
Dyfyniad MLAJohn XXIII, Pope. Apostolic Constitution Convoking the Second Vatican Ecumenical Council. National Catholic Welfare Conference, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.