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.

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, and Francis Elmer McMahon. The Obligation of Catholics to Promote Peace. New York: The Paulist Press, 1940.

Catholic Association for International Peace (U.S.). Committee on Ethics, et al. The Obligation of Catholics to Promote Peace. The Paulist Press, 1940.