APA (7th ed.) Citation

Pius XI, P. (1930). St. Augustine: Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C..

Chicago Style (17th ed.) Citation

Pius XI, Pope. St. Augustine: Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1930.

MLA (8th ed.) Citation

Pius XI, Pope. St. Augustine: Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1930.

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