APA (7th ed.) Citation

Pius XII, P. (1943). 1942 Christmas message. National Catholic Welfare Conference.

Chicago Style (17th ed.) Citation

Pius XII, Pope. 1942 Christmas Message. Washington, D.C.: National Catholic Welfare Conference, 1943.

MLA (8th ed.) Citation

Pius XII, Pope. 1942 Christmas Message. National Catholic Welfare Conference, 1943.

Warning: These citations may not always be 100% accurate.