CATHERINE KING, Effigies, in Siena, Florence and Padua. Art, society and religion 1280-1400, a cura di diana norman,New Haven, Yale University Press 1995, vol. II, Case Studies, p. 105-127, illustrato, colore
TIM BENTON, The three cities compared, in Siena, Florence and Padua. Art, society and religion 1280-1400, a cura diana norman, New Haven, Yale University Press 1995, vol. I, Interpretative Essays, p. 7-27, illustrato, colore