Cara Greenberg, Op to Pop: Furniture of the 1960s, New York, 1999, pp. 58-59 for examples from the “Molar” series
Donald Albrecht, AutoPlastic: Wendell Castle, 1968-1973, exh. cat., R 20th Century, New York, 2004, for an early white example
Julie V. Iovine, “Plastic Fantastic: Wendell Castle’s Red, Yellow and Blue Period,” New York Times Style Magazine, April 1, 2007, p. 40
Alastair Gordon, Wendell Castle: Wandering Forms, Works from 1959-1979, exh. cat., The Aldrich Contemporary Art Museum, Ridgefeld, 2012, pp. 154-57 for a sketch of the model and a white example