Clemens, R. and T. Graham, “Introduction to Manuscript Studies” (London: Cornell University Press, 2007).
Sarolea, Charles, “Preface,” Iconografia Dantesca: The Pictorial Representations in Dante’s Divine Comedy (London: H. Grevel, 1899).
L. Volkmann, Iconografia Dantesca: The Pictorial Representations in Dante’s Divine Comedy (London: H. Grevel, 1899), pp. 46-64.
Quinones, Ricardo, https://www.britannica.com/biography/Dante-Alighieri/The-Divine-Comedy
Dante Encyclopedia, ed. by Richard Lansing, (New York: Taylor and Francis, 2000), pp. 198-201.
Divina Commedia 