APA (7th ed.) Citation

Catholic Church. Pope (1963-1978 : Paulus VI). (1971). Apostolic letter Octogesima adveniens / of His Holiness Pope Paul VI, to Maurice Cardinal Roy ... on the occasion of the eightieth anniversary of the Encyclical Rerum novarum. Catholic Truth Society.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1963-1978 : Paulus VI). Apostolic Letter Octogesima Adveniens / of His Holiness Pope Paul VI, to Maurice Cardinal Roy ... on the Occasion of the Eightieth Anniversary of the Encyclical Rerum Novarum. London: Catholic Truth Society, 1971.

MLA (8th ed.) Citation

Catholic Church. Pope (1963-1978 : Paulus VI). Apostolic Letter Octogesima Adveniens / of His Holiness Pope Paul VI, to Maurice Cardinal Roy ... on the Occasion of the Eightieth Anniversary of the Encyclical Rerum Novarum. Catholic Truth Society, 1971.