APA

Catholic Church. Pope (1922-1939 : Pius XI); National Catholic Welfare Conference, . (1960). Encyclical letter of His Holiness Pius XI, by divine providence, pope ... on reconstructing the social order and perfecting it conformably to the precepts of the gospel, in commemoration of the fortieth anniversary of the encyclical "Rerum novarum.". London: CAtholic Truth Society.

Chicago

Catholic Church. Pope (1922-1939 : Pius XI); National Catholic Welfare Conference, . 1960. Encyclical letter of His Holiness Pius XI, by divine providence, pope ... on reconstructing the social order and perfecting it conformably to the precepts of the gospel, in commemoration of the fortieth anniversary of the encyclical "Rerum novarum.". London: CAtholic Truth Society.

Harvard

Catholic Church. Pope (1922-1939 : Pius XI); National Catholic Welfare Conference, . (1960). Encyclical letter of His Holiness Pius XI, by divine providence, pope ... on reconstructing the social order and perfecting it conformably to the precepts of the gospel, in commemoration of the fortieth anniversary of the encyclical "Rerum novarum.". London: CAtholic Truth Society.

MLA

Catholic Church. Pope (1922-1939 : Pius XI); National Catholic Welfare Conference, . Encyclical letter of His Holiness Pius XI, by divine providence, pope ... on reconstructing the social order and perfecting it conformably to the precepts of the gospel, in commemoration of the fortieth anniversary of the encyclical "Rerum novarum.". London: CAtholic Truth Society. 1960.