APA (7th ed.) Citation

MacLean, D. A. (1931). The Permanent Peace Program of Pope Benedict XV. New York.

Chicago Style (17th ed.) Citation

MacLean, Donald Alexander. The Permanent Peace Program of Pope Benedict XV. New York, 1931.

MLA (8th ed.) Citation

MacLean, Donald Alexander. The Permanent Peace Program of Pope Benedict XV. New York, 1931.

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