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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)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, và Francis Elmer McMahon. The Obligation of Catholics to Promote Peace. New York: The Paulist Press, 1940.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Catholic Association for International Peace (U.S.). Committee on Ethics, et al. The Obligation of Catholics to Promote Peace. The Paulist Press, 1940.