Robert Indiana and Mary Swift. Interview with Robert Indiana, 1981 August 25. Mary Swift papers, 1973-2004. Archives of American Art, Smithsonian Institution.
Robert Indiana. Robert Indiana artists' statement, between 1962 and 1968. Stable Gallery records, 1916-1999. Archives of American Art, Smithsonian Institution.
Robert Indiana. Postcard from Robert Indiana to Eleanor Ward and Alan Groh at the Stable Gallery, 1962 Apr.. Stable Gallery records, 1916-1999. Archives of American Art, Smithsonian Institution.
Robert Indiana. Robert Indiana postcard to Multiples Gallery, 1968 September 17. Robert Indiana postcard to Multiples Gallery, 1968 Sept. 17. Archives of American Art, Smithsonian Institution.
Robert Indiana. Robert Indiana greeting card to Dorothy C. Miller, 1964. Dorothy C. Miller papers, 1853-2013. Archives of American Art, Smithsonian Institution.
Lee Krasner and Robert Indiana. Unidentified radio interview with Lee Krasner, Robert Indiana, and Paul Jenkins, 1976. Jackson Pollock and Lee Krasner papers, circa 1914-1984. Archives of American Art, Smithsonian Institution.
Robert Indiana prints : a catalogue raisonne, 1951-1991 / by Susan Sheehan ; with the assistance of Poppy Gandler Orchier and Catherine Mennenga ; introd. and interview by Poppy Gandler Orchier