The artist; purchased 12 February 1999 through (Matthew Marks Gallery, New York) by NGA.
- Ellsworth Kelly: On the Roof, The Metropolitan Museum of Art, New York, 1998, unnumbered brochure, repro.
- Sims, Patterson, and Emily Rauh Pulitzer. Ellsworth Kelly: Sculpture. Exh. cat. Whitney Museum of American Art, New York, 1982: 103, 105, no. 57, repro.
- Cigola, Francesca. Art Parks: A Tour of America’s Sculpture Parks and Gardens. New York: Princeton Architectural Press, 2013: 101.