Group exhibition catalogue Hultén, K[arl] G[unnar] Pontus. – The machine as seen at the end of the mechanical age. – New York : The Museum of Modern Art, 1968. – 216 p.
Group exhibition The Machine As Seen at the End of the Mechanical Age, The Museum of Modern Art, New York, N. Y., United States, November 25, 1968-February 9, 1969.