"Pichler". Catholic Encyclopedia. New York: Robert Appleton Company. ↑ Italian Paintings by Federico Zeri and Elizabeth E. Gardner, pgs 81-83 ↑ Painting in Renaissance Siena 1420-1500 by the Metropolitan Museum of Art, pgs 138-167 ↑ Vienna by Nicholas Parsons, pgs 24 and 147 ↑ European Art of the Sixteenth Century by Stefano Zuffi, pgs 8-9 ↑ Siena Cathedral site ↑ Western Decorative Arts edited by Rudolf Distelberger, pgs 124-125 ↑ The National Gallery (UK) ↑ Renaissance Rivals by Rona Goffen, pgs 227-262 ↑ A Biographical Dictionary by Joseph Strutt ↑ The Paintings of Giacomo Del Po by Donald Neil Rabiner ↑ Dictionary of Women Artists, Volume 1 edited by Delia Gaze, pg 61 ↑ Court, Cloister, and City by Thomas DaCosta Kaufmann, pg 270 ↑ Pietas Austriaca by Anna Coreth, pg 53 ↑ European art of the fifteenth century by Stefano Zuffi, pg 339 ↑ The Pollaiuolo brothers by Alison Wright ↑ Cesati, Franco (2002).