Catholic Association for International Peace (U.S.). Committee on Ethics, Catholic Association for International Peace (U.S.). Joint Policy Committee, National Catholic Welfare Conference. Study Club Committee, Ryan, J. A., & McMahon, F. E. (1940). The obligation of Catholics to promote peace. The Paulist Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Association for International Peace (U.S.). Committee on Ethics, Catholic Association for International Peace (U.S.). Joint Policy Committee, National Catholic Welfare Conference. Study Club Committee, John A. Ryan, و Francis Elmer McMahon. The Obligation of Catholics to Promote Peace. New York: The Paulist Press, 1940.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Association for International Peace (U.S.). Committee on Ethics, et al. The Obligation of Catholics to Promote Peace. The Paulist Press, 1940.