[279].Hyman, Sienese Painting, p.159.
[280].Keith Christiansen, ‘Painting in Renaissance Siena’, in K. Christiansen, L. B. Kanter and C. B. Strehlke, Painting in Renaissance Siena, 1420——1500, exh. cat., Metropolitan Museum of Art, New York (New York, 1989), pp.3——32, here p.15.
[281].Hyman, Sienese Painting, p.167.
[282].See Kenneth Clark, Piero della Francesca (London, 1951), p.8.
[283].Carlo Ginzburg, The Enigma of Piero (London, 1985), p.126.