New York, 9 September 1981 - Institutional correspondence An internal letter from Richard E. Oldenburg to staff at the Museum of Modern Art, New York
New York, 24 March 1980 - Institutional correspondence A letter from Richard Oldenburg and William Rubin to Javier Tusell
<em>Life</em>, New York, November 8, 1968, front cover - Article “As the bombing stops—THIS GIRL TRON”