APA
John XXIII, . (1963). Encyclical letter "World peace" (Pacem in terris) of His Holiness John XXIII by divine providence Pope to his venerable brothers, the patriarchs, primates, archbishops, bishops, and other local ordinaries, in peace and communion with the Apostolic see, to. Melbourne: The Australian Catholic Truth Society.
Chicago
John XXIII, . 1963. Encyclical letter "World peace" (Pacem in terris) of His Holiness John XXIII by divine providence Pope to his venerable brothers, the patriarchs, primates, archbishops, bishops, and other local ordinaries, in peace and communion with the Apostolic see, to. Melbourne: The Australian Catholic Truth Society.
Harvard
John XXIII, . (1963). Encyclical letter "World peace" (Pacem in terris) of His Holiness John XXIII by divine providence Pope to his venerable brothers, the patriarchs, primates, archbishops, bishops, and other local ordinaries, in peace and communion with the Apostolic see, to. Melbourne: The Australian Catholic Truth Society.
MLA
John XXIII, . Encyclical letter "World peace" (Pacem in terris) of His Holiness John XXIII by divine providence Pope to his venerable brothers, the patriarchs, primates, archbishops, bishops, and other local ordinaries, in peace and communion with the Apostolic see, to. Melbourne: The Australian Catholic Truth Society. 1963.