lower right in graphite: rf Lichtenstein; lower center inscribed in plate: Reproduced from "Knock, Knock" 1961
the artist, New York; acquired 1996 by the National Gallery of Art
Associated NamesLichtenstein, Roy
- Corlett, Mary Lee, and Ruth E. Fine. The Prints of Roy Lichtenstein: A Catalogue Raisonné 1948-1997. New York and Washington, D.C.: Hudson Hills Press and the National Gallery of Art, 2002, no. App.8.