on copper plate, attached to top side of front bottom brass bar: Ferber 66
William S. Rubin, New York; gift 1977 to NGA.
- Herbert Ferber: Sculpture, Painting and Drawing 1946-1980, The Museum of Fine Arts, Houston, 1981, no. 35.
- Sculpture: An Illustrated Catalogue. National Gallery of Art, Washington, 1994: 83, repro.