APA (7th ed.) Citation

Pius XI, P. (1930). On christian marriage: Casti connubii ; Encyclical letter of Pope Pius XI. New York.

Chicago Style (17th ed.) Citation

Pius XI, Pope. On Christian Marriage: Casti Connubii ; Encyclical Letter of Pope Pius XI. New York, 1930.

MLA (8th ed.) Citation

Pius XI, Pope. On Christian Marriage: Casti Connubii ; Encyclical Letter of Pope Pius XI. New York, 1930.

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