Pius XII, P. (1956). The message of Bethlehem and problems of the day: 1955 Christmas message. National Catholic Welfare Conference.
Chicago-referens (17:e uppl.)Pius XII, Pope. The Message of Bethlehem and Problems of the Day: 1955 Christmas Message. Washington, D.C.: National Catholic Welfare Conference, 1956.
MLA-referens (8:e uppl.)Pius XII, Pope. The Message of Bethlehem and Problems of the Day: 1955 Christmas Message. National Catholic Welfare Conference, 1956.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.