APA (7th ed.) Citation

Pius XII, P. (1951). To all who are in prison: A message. National Catholic Welfare Conference.

Chicago Style (17th ed.) Citation

Pius XII, Pope. To All Who Are in Prison: A Message. Washington, D.C.: National Catholic Welfare Conference, 1951.

MLA (8th ed.) Citation

Pius XII, Pope. To All Who Are in Prison: A Message. National Catholic Welfare Conference, 1951.

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