Catholic Church. Pope (1963-1978 : Paulus VI). (1971). Apostolic letter of His Holiness Pope Paul VI to Cardinal Maurice Roy ... on the occasion of the eightieth anniversary of the encyclical Rerum novarum. Australian Catholic Trust Society.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1963-1978 : Paulus VI). Apostolic Letter of His Holiness Pope Paul VI to Cardinal Maurice Roy ... on the Occasion of the Eightieth Anniversary of the Encyclical Rerum Novarum. Melbourne: Australian Catholic Trust Society, 1971.
MLA引文Catholic Church. Pope (1963-1978 : Paulus VI). Apostolic Letter of His Holiness Pope Paul VI to Cardinal Maurice Roy ... on the Occasion of the Eightieth Anniversary of the Encyclical Rerum Novarum. Australian Catholic Trust Society, 1971.