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.
Παραπομπή σε μορφή Chicago (17η εκδ.)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, και Francis Elmer McMahon. The Obligation of Catholics to Promote Peace. New York: The Paulist Press, 1940.
Παραπομπή σε μορφή MLA (8th εκδ.)Catholic Association for International Peace (U.S.). Committee on Ethics, et al. The Obligation of Catholics to Promote Peace. The Paulist Press, 1940.