Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. (1936). The Catholic priesthood (Ad Catholici Sacerdotii): Encyclical of His Holiness Pope Pius XI : with excerpts on the priesthood from other encyclicals (2nd printing, thirty-fifth thousand.). America Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. The Catholic Priesthood (Ad Catholici Sacerdotii): Encyclical of His Holiness Pope Pius XI : With Excerpts on the Priesthood from Other Encyclicals. 2nd printing, thirty-fifth thousand. New York, N.Y.: America Press, 1936.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. The Catholic Priesthood (Ad Catholici Sacerdotii): Encyclical of His Holiness Pope Pius XI : With Excerpts on the Priesthood from Other Encyclicals. 2nd printing, thirty-fifth thousand. America Press, 1936.