[274].Petrarch, ‘Per mirar Policleto a prova iso’, Sonnet 77; in Petrarch, Canzoniere, trans.J. G. Nichols (London, 2000), p.77.
[275].Timothy Hyman, Sienese Painting: The Art of a City-Republic (1278——1477) (London, 2003).
[276].Keith Christiansen, Gentile da Fabriano (London, 1982) p.45.
[277].Paul Hills, The Light of Early Italian Painting (New Haven, CT, and London, 1987), p.126.
[278].James R. Banker, ‘The program for the Sassetta altarpiece in the church of S. Francesco in Borgo S. Sepolcro’, I Tatti Studies in the Italian Renaissance, vol. 4, 1991, pp.11——58, here p.12.