Federico Zeri. Letter to Joseph Baillio. June 16, 1986, judging from photographs, calls it an astonishingly beautiful painting by Pietro Lorenzetti.
Paul Jeromack. "Getty Buys Northumberland Raphael—Met Nets Lorenzetti." The Art Newspaper.com. 2002 [www.theartnewspaper.com/news/article.asp?idart=10234].
Keith Christiansen in "Recent Acquisitions, A Selection: 2002–2003." Metropolitan Museum of Art Bulletin 61 (Fall 2003), p. 15, ill. (color, overall and detail).
Keith Christiansen. "Paul Delaroche's 'Crucifixion' by Pietro Lorenzetti." Apollo, n.s., 157 (February 2003), pp. 8–14, ill. on cover (color detail), ill. p. 1 (color), color figs. 1 (obverse), 2 (reverse), states that it belongs to a portable altarpiece originally composed of four, or less possibly six, panels illustrating the Passion of Christ, of which one other panel is known, a Christ before Pilate (Vatican Museums); dates it to the 1340s.
Marco Grassi. "The Metropolitan Duccio." New Criterion 23 (February 2005), p. 80.
Victor M. Schmidt. Painted Piety: Panel Paintings for Personal Devotion in Tuscany, 1250–1400. Florence, 2005, pp. 45, 67 n. 64, pp. 288–89, 293, 324 n. 16, figs. 206–7 (obverse and reverse).
Keith Christiansen. "Duccio and the Origins of Western Painting." Metropolitan Museum of Art Bulletin 66 (Summer 2008), pp. 44–45, fig. 37 (color), notes that when Paul Delaroche owned the picture in the nineteenth century he ascribed it to Giotto and suggests that Delaroche identified it with a work recorded by Vasari in a monk's cell at the monastery of Camaldoli: "'a little Crucifixion with a gold background, by Giotto, that was very beautiful'"; calls this an example of "early, optimistic attributions, which were based more on wishful thinking than on real knowledge of the period".
Ada Labriola in Maestri senesi e toscani nel Lindenau-Museum di Altenburg. Exh. cat., Complesso museale. Siena, 2008, p. 49 n. 14, accepts as plausible that the panel is from the same complex as the Vatican "Christ before Pilate", which she dates to the last years of the artist's activity.
Keith Christiansen in Philippe de Montebello and The Metropolitan Museum of Art, 1977–2008. New York, 2009, p. 36.
Dillian Gordon. The Italian Paintings Before 1400. London, 2011, p. 297 n. 15.