(U.S.), C. A. f. I. P. (1930). Causes of War, and Security, Old and New; preliminary studies presented to the Catholic Association for International Peace by the Committee on Sources of International Enmity and the Europe Committee. Washington, D.C..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)(U.S.), Catholic Association for International Peace. Causes of War, and Security, Old and New; Preliminary Studies Presented to the Catholic Association for International Peace by the Committee on Sources of International Enmity and the Europe Committee. Washington, D.C., 1930.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)(U.S.), Catholic Association for International Peace. Causes of War, and Security, Old and New; Preliminary Studies Presented to the Catholic Association for International Peace by the Committee on Sources of International Enmity and the Europe Committee. Washington, D.C., 1930.