Cita APA (7a ed.)

Paul VI, P. (1968). The Holy Father's message for world communications day, May 26, 1968. [publisher not identified].

Cita Chicago Style (17a ed.)

Paul VI, Pope. The Holy Father's Message for World Communications Day, May 26, 1968. [Place of publication not identified]: [publisher not identified], 1968.

Cita MLA (8a ed.)

Paul VI, Pope. The Holy Father's Message for World Communications Day, May 26, 1968. [publisher not identified], 1968.