APA (7th ed.) Citation

Pius XII, P. The letter of Pope Pius XII to the Claretians on their centennial. [publisher not identified].

Chicago Style (17th ed.) Citation

Pius XII, Pope. The Letter of Pope Pius XII to the Claretians on Their Centennial. [Place of publication not identified]: [publisher not identified].

MLA (8th ed.) Citation

Pius XII, Pope. The Letter of Pope Pius XII to the Claretians on Their Centennial. [publisher not identified].

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