Heylen, L. (1865). The progress of the age, and the danger of the age: Two lectures delivered before the St. Xavier Conference of the St. Vincent de Paul Brotherhood in the hall of St. Louis University. J. P. Walsh.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Heylen, Louis. The Progress of the Age, and the Danger of the Age: Two Lectures Delivered Before the St. Xavier Conference of the St. Vincent De Paul Brotherhood in the Hall of St. Louis University. Cincinnati: J. P. Walsh, 1865.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Heylen, Louis. The Progress of the Age, and the Danger of the Age: Two Lectures Delivered Before the St. Xavier Conference of the St. Vincent De Paul Brotherhood in the Hall of St. Louis University. J. P. Walsh, 1865.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.