APA (7th ed.) Citation

Catholic Church. Pope & John XXIII, P. (1962). Encyclical letter (Aeterna Dei Sapientia): Of His Holiness John XXIII...A call to unity. Catholic Truth Society.

Chicago Style (17th ed.) Citation

Catholic Church. Pope and Pope John XXIII. Encyclical Letter (Aeterna Dei Sapientia): Of His Holiness John XXIII...A Call to Unity. London: Catholic Truth Society, 1962.

MLA (8th ed.) Citation

Catholic Church. Pope and Pope John XXIII. Encyclical Letter (Aeterna Dei Sapientia): Of His Holiness John XXIII...A Call to Unity. Catholic Truth Society, 1962.