APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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