Chicago, 14 September 1939 - Institutional correspondence Alice Roullier's letter to Evelyn Ahrend, dated 14 September 1939
Chicago, 12 October 1939 - Institutional correspondence Alice Roullier's letter to Evelyn Ahrend, dated 12 October 1939
New York: Praeger Publishers Inc., 1973 - Essay Six Years: The Dematerialization of the Art Object from 1966 to 1972