lower left in graphite: Etat IV 1/3; lower right in graphite: SWH / 22-4'45
(Hirschl & Adler, New York); acquired 2009 by the National Gallery of Art
- Black, Peter, and Désirée Moorhead. The Prints of Stanley William Hayter: A Complete Catalogue. Mount Kisco, New York: Moyer Bell Limited, 1992, no. 165, iv/vi.