Emelio Ambasz, Italy: The New Domestic Landscape: Achievements and Problems of Italian Design, exh. cat., The Museum of Modern Art, New York, 1972, p. 106; Hans Höger, Ettore Sottsass Jun. Designer, Artist, Architect, Tübingen, 1993, p. 90; Fulvio Ferrari and Napoleone Ferrari, Luce: Lampade 1968-1973: il nuovo design italiano, Turin, 2002, pl. 153; Charlotte and Peter Fiell, eds., Domus Vol. VI 1965-1969, Cologne, 2006, pp. 436 and 500 for similar examples