lower left in graphite: Etat IV 2/S; lower right in graphite: SWHayter 53; lower right in graphite by unknown hand: 70-; lower right verso in graphite by unknown hand: 936/70-
- Black, Peter, and Désirée Moorhead. The Prints of Stanley William Hayter: A Complete Catalogue. Mount Kisco, New York: Moyer Bell Limited, 1992, no. 210.