Pius IX, P. (1865). The Encyclical Letter of His Holiness, Pius IX, together with the Syllabus of Errors Condemned, to which is added the brief, "Arcano Divinae Providentiae" of 1846. Argus Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pius IX, Pope. The Encyclical Letter of His Holiness, Pius IX, Together with the Syllabus of Errors Condemned, to Which Is Added the Brief, "Arcano Divinae Providentiae" of 1846. Albany: Argus Company, 1865.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Pius IX, Pope. The Encyclical Letter of His Holiness, Pius IX, Together with the Syllabus of Errors Condemned, to Which Is Added the Brief, "Arcano Divinae Providentiae" of 1846. Argus Company, 1865.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.