Coba jelasin Catatan dari Ugolino di Nerio dong

Davies, Martin. In: "National Gallery Catalogues: Catalogue of the Earlier Italian Schools". National Gallery Catalogues, London 1961, reprinted 1986, ISBN 0-901791-29-6

There is also a painting by this Italian Gothic painter in the National Gallery of Ireland(Dublin)("Propher Isaiah").

Also there is a painting by this painter in the Philadelphia Museum of Art("Prophet Daniel").