Pius, P. C. C. P. (1939). Summi Pontificatus, The First Encyclical of Pope Pius XII on the Need For Unity in Society. S.l..
Chicago Style (17th ed.) CitationPius, Pope; Catholic Church. Pope. Summi Pontificatus, The First Encyclical of Pope Pius XII on the Need For Unity in Society. S.l., 1939.
MLA (8th ed.) CitationPius, Pope; Catholic Church. Pope. Summi Pontificatus, The First Encyclical of Pope Pius XII on the Need For Unity in Society. S.l., 1939.
Warning: These citations may not always be 100% accurate.