Millard Meiss, Painting in Florence and Siena after thr Black Death (Princeton, 1951), pp. 34-45, fig. 50; Wolfgang Braunfels, Die Heilige Dreifaltigkeit (Düsseldorf, 1954), p.xli, fig. 42; Millard Meiss, "Notes on Three Linked Sienese Styles," Art Bulletin 45 (1963): 47-48; Bernard Berenson, Italian Pictures of the Renaissance: Central Italian and North Italian Schools, 3 vols. (London, 1968), 1.:226; H. W. van Os, Marias Denut und Verherrlichung in der sienesischen Malerei, 1300-1450 (The Hague, 1.969), pp. 68 nn. 94, 96, p. 71 n.109; Agnes
Mongan and Elizabeth Mongan, European Paintings in the Timken Art Gallery (San Diego, 1969), pp. 22-2),107, no. J, ill.; Burton Fredericksen and Federico Zeri, Census of Pre-Nineteenth-Century Italian Paintings in North American Public Collections (Cambridge, Mass., 1972), pp.113, 268,272,284,291,295,297,302,360,632; Sherwood A. Fehm, Jr., The Collaboration of Niccolò Tegliacci and Luca
di Tommeè (Malibu, Calif., 1973), p. 30; Cristina de Benedictis, La pittura senese, 1330-1370 (Florence, 1979), pp. 48, 67, 88, fig. 90; Enzo Carli, La pittura senese del trecento (Milan,1981), p. 225; Martin E. Petersen, "Three Centuries of European Paintings, 1300-16oo," Apollo 115 (June 1982): 441, fig. 3; Timken Art Gallery: European and American Works of Art in the Putnam Foundation Collection (San Diego, 1983), pp. 56-57, 120, no. 19, ill; J. Gellrich, The Idea of the Book in the Middle Ages: Language Theory, Mythology, and Fiction (Ithaca, N.Y., 1985), p. 58, pl. 4i Sherwood A. Fehm, Jr., Luca di Tommb A Sienese Fourteenth-Century Painter (Carbondale, IlL, 1986), pp.11-12, 61-65, ill.; John T. Paoletti, "The Strozzi Altarpiece Reconsidered," Memorie D omenicane, n.s., no. 20 (1.989): 279-300, ill.; Anna Maria d'Achille, "Sull'iconografia trinitaria medievale: LaTrinit.?t del Santuario sui Monte Autore presso Valletpietra," Arte Medievale, ser. 2, 5, no.1 (1991): 57,
