Ralph McInerny (1963). "Chapter IV - The School of Chartres". A History of Western Philosophy Vol. II - Part III: The Twelfth Century. The Jacques Maritain Center, University of Notre Dame. Archived from the original on November 23, 2014. Retrieved August 29, 2007.
maritain.nd.edu
William Turner (1903). "Chapter XXXIII - The School of Chartres". History of Philosophy. The Jacques Maritain Center, University of Notre Dame. Retrieved August 29, 2007.
web.archive.org
Ralph McInerny (1963). "Chapter IV - The School of Chartres". A History of Western Philosophy Vol. II - Part III: The Twelfth Century. The Jacques Maritain Center, University of Notre Dame. Archived from the original on November 23, 2014. Retrieved August 29, 2007.
