Tolong jelaskan mengenai Catatan dari Ugolino della Gherardesca

Paola Benigni, Massimo Becattini. Ugolino della Gherardesca: cronaca di una scoperta annunciata. Archeologia Viva n 128 (2008).

Thomas Caldecot Chub. Dante and His World. Boston: Little, Brown and Co. (1996).

Joan M. Ferrante. The Political Vision of the Divine Comedy. Princeton: Princeton University Press (1984).

Robert Hollander. "Inferno XXXIII, 37-74: Ugolino’s Importunity". Speculum 59 (July 1984), p. 549–55.

Robert Hollander. Circle 9  The Trustees of Princeton University (1997).

James Miller. Dante & the Unorthodox; The Aesthetics of Transgression. Waterloo, Canada: Wilfrid University Press (2005).

Gilbert, Allan H. Dante’s Conception of Justice. Duke University Press, 1925.

Francesco Mallegni, M. Luisa Ceccarelli Lemut. Il conte Ugolino di Donoratico tra antropologia e storia (2003). ISBN 88-8492-059-0.

Nicole Martinelli, "Dante and the Cannibal Count", Newsweek (1 February 2007).

Guy P. Raffa. Circle 9, Cantos 31–34. University of Texas at Austin (2002).

Theodore Spencer. "The Story of Ugolino in Dante and Chaucer". Speculum 9 (July 1934), p. 295–301.

Paget Toynbee, A Dictionary of the Proper Names and Notable Matters in the Works of Dante, Oxford University Press (1968).

Frances A. Yates. "Transformations of Dante's Ugolino". Journal of the Warburg and Courtauld Institutes 14 (1951), p. 92–117.

World of Dante Multimedia website that offers Italian text of Divine Comedy, Allen Mandelbaum's translation, gallery, interactive maps, timeline, musical recordings, and searchable database. The gallery contains numerous artistic renditions of Inf.33, the Ugolino episode.