APA (7th ed.) Citation

Pius, P. C. C. P. (1944). 1944 Christmas Message of Pope Pius XII. Washington, D.C..

Chicago Style (17th ed.) Citation

Pius, Pope; Catholic Church. Pope. 1944 Christmas Message of Pope Pius XII. Washington, D.C., 1944.

MLA (8th ed.) Citation

Pius, Pope; Catholic Church. Pope. 1944 Christmas Message of Pope Pius XII. Washington, D.C., 1944.

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