APA (7th ed.) Citation

Paul VI, P. (1973). On world communications day: Message, May 1, 1973. Publications Office, United States Catholic Conference.

Chicago Style (17th ed.) Citation

Paul VI, Pope. On World Communications Day: Message, May 1, 1973. Washington, D.C.: Publications Office, United States Catholic Conference, 1973.

MLA (8th ed.) Citation

Paul VI, Pope. On World Communications Day: Message, May 1, 1973. Publications Office, United States Catholic Conference, 1973.