Till-Holger. Van Eyck to Dürer: The Influence of Early Netherlandish painting on European Art, 1430–1530. London: Thames & Hudson, 2011. ISBN 978-0-500-23883-7
America, 1915-1941: Reordering Reality (New York: Abrams, 1994), p. 21. Stavitsky, p. 19. Milton Brown, American Painting from the Armory Show to the Depression