APA

Pius XI P., . (1955). Encyclical letter (Quadragesimo anno) of His Holiness Pius XI by divine providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops, and other ordinaries in peace and communion with the Apostolic See, and to all the faithful. Melbourne: .

Chicago

Pius XI Pope, . 1955. Encyclical letter (Quadragesimo anno) of His Holiness Pius XI by divine providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops, and other ordinaries in peace and communion with the Apostolic See, and to all the faithful. Melbourne: .

Harvard

Pius XI P., . (1955). Encyclical letter (Quadragesimo anno) of His Holiness Pius XI by divine providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops, and other ordinaries in peace and communion with the Apostolic See, and to all the faithful. Melbourne: .

MLA

Pius XI Pope, . Encyclical letter (Quadragesimo anno) of His Holiness Pius XI by divine providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops, and other ordinaries in peace and communion with the Apostolic See, and to all the faithful. Melbourne: . 1955.