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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeylen, 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.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHeylen, 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.
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