Catholic Church. National Conference of Catholic Bishops, National Catholic Welfare Council (U.S.), & Gibbons, J. (1920). Pastoral letter of the archbishops and bishops of the United States assembled in conference at the Catholic University of America, September, 1919. National Catholic welfare council.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. National Conference of Catholic Bishops, National Catholic Welfare Council (U.S.), و James Gibbons. Pastoral Letter of the Archbishops and Bishops of the United States Assembled in Conference at the Catholic University of America, September, 1919. Washington, D.C.: National Catholic welfare council, 1920.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. National Conference of Catholic Bishops, et al. Pastoral Letter of the Archbishops and Bishops of the United States Assembled in Conference at the Catholic University of America, September, 1919. National Catholic welfare council, 1920.