APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) & Ryan, J. H. (1927). The encyclicals of Pius XI. B. Herder book co..

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and James Hugh Ryan. The Encyclicals of Pius XI. St. Louis, Mo., London: B. Herder book co., 1927.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and James Hugh Ryan. The Encyclicals of Pius XI. B. Herder book co., 1927.

Warning: These citations may not always be 100% accurate.