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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)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.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)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.