Private collection, Germany
Acquired from the above by the present owner
Kazuko Sato, Alchimia: Contemporary Italian Design, Berlin, 1988, p. 17, fig. 7 for a drawing, p. 20, fig. 11
Hans Höger, Ettore Sottsass Jun. Designer, Artist, Architect, Tübingen, 1993, p. 94, fig. 67
Barabara Radice, Ettore Sottsass: A Critical Biography, London, 1993, p. 196