Pius, P. C. C. P. (1937). On Atheistic Communism, Encyclical of His Holiness Pope Pius XI. New York.
Chicago Style (17th ed.) CitationPius, Pope; Catholic Church. Pope. On Atheistic Communism, Encyclical of His Holiness Pope Pius XI. New York, 1937.
MLA (8th ed.) CitationPius, Pope; Catholic Church. Pope. On Atheistic Communism, Encyclical of His Holiness Pope Pius XI. New York, 1937.
Warning: These citations may not always be 100% accurate.