APA (7th ed.) Citation

Pius XII, P., & Ward, B. (1939). Social letters of His Holiness Pope Pius XII. Catholic Social Guild.

Chicago Style (17th ed.) Citation

Pius XII, Pope, and Barbara Ward. Social Letters of His Holiness Pope Pius XII. Oxford: Catholic Social Guild, 1939.

MLA (8th ed.) Citation

Pius XII, Pope, and Barbara Ward. Social Letters of His Holiness Pope Pius XII. Catholic Social Guild, 1939.

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