lower left in plate: Jacques-Henri Lévesque; lower right in plate: Hayter; lower left in graphite: 50/50
(Sylvan Cole Gallery, New York); acquired 1997 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. 181.