An Outline of an Explanation of the Psalter, the explanation, Occasion and Division is from The Psalms Explained by Rev. C.J. Callan, O.P. and Rev. John A. McHugh, O.P.; The Liturgical application from Wolter's Psallite Sapienter and Dr. Adalbert Schulte's Die Psalmen des Breviers, CMTH 33/85. Michael A. Mathis Papers, MTH. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/391008 Accessed May 20, 2024.