توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Catholic Church. Pope (1922-1939 : Pius XI) & Treacy, G. C. Atheistic communism: Encyclical letter of His Holiness Pope Pius XI (with discussion club outline). Paulist Press.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Catholic Church. Pope (1922-1939 : Pius XI) و Gerald C. Treacy. Atheistic Communism: Encyclical Letter of His Holiness Pope Pius XI (with Discussion Club Outline). New York: Paulist Press.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Catholic Church. Pope (1922-1939 : Pius XI) و Gerald C. Treacy. Atheistic Communism: Encyclical Letter of His Holiness Pope Pius XI (with Discussion Club Outline). Paulist Press.