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.