Frances A. Yates. "Transformations of Dante's Ugolino". Journal of the Warburg and Courtauld Institutes 14(1/2) (1951), p. 92–117. doi:10.2307/750354. JSTOR750354.
jstor.org
Frances A. Yates. "Transformations of Dante's Ugolino". Journal of the Warburg and Courtauld Institutes 14(1/2) (1951), p. 92–117. doi:10.2307/750354. JSTOR750354.