John XXIII, P. (1960). Christmas message 1959. National Catholic Welfare Conference.
Cita Chicago Style (17a ed.)John XXIII, Pope. Christmas Message 1959. Washington, D.C.: National Catholic Welfare Conference, 1960.
Cita MLA (8a ed.)John XXIII, Pope. Christmas Message 1959. National Catholic Welfare Conference, 1960.
Precaución: Estas citas no son 100% exactas.