1. Alighieri, Dante. The Divine Comedy: A New and Revised Translation. Translated by Steve Ellis. London: Penguin, 2019.
2. Aquinas, Thomas. Summa Theologica. Translated by Fathers of the English Dominican Province. New York: Benziger Brothers, 1911-1925.
3. The Van der Weyden/Flémalle problem
4. Bacon, Roger. Roger Bacon’s Letter: Concerning the Marvelous Power of Art and Nature and the Nullity of Magic, translated by Tenney Lombard Davis. Whitefish, MT: Kessinger Publishing, 2010.
5. Bacon, Roger. The Greek Grammar of Roger Bacon and a Fragment of his Hebrew Grammer, edited with an introduction and notes by Edmond Nolan and Samuel A. Hirsch. Cambridge: Cambridge University Press, 1902.