lower left in plate: Austin 21; lower center in graphite: Robert Austin 1922
- Dodgson, Campbell. A Catalogue of Etchings and Engravings by Robert Austin, R.E., 1913-1929. London: Twenty-One Gallery, 1930, no. 28, ii/ii.
- Drawings and Prints by Robert Sargent Austin, with a Complete Catalog of His Prints. London: Fine Art Society, 2001, no. 28.