R 20th Century, New York
Acquired from the above by the present owner
Cara Greenberg, Op to Pop: Furniture of the 1960s, New York, 1999, pp. 58-59 for examples from the original “Molar” series
Donald Albrecht, AutoPlastic: Wendell Castle, 1968-1973, exh. cat., R 20th Century, New York, 2004, pp. 158-159 for original examples and the re-edition