Private collection, Florence, acquired directly from the manufacturer, circa 1970
'Proposte', Domus, no. 488, July 1970, n.p.
Hans Höger, Ettore Sottsass Jun. Designer, Artist, Architect, Tübingen, 1993, p. 91
Fulvio Ferrari and Napoleone Ferrari, Luce Lampade 1968-1973: il nuovo design italiano, Turin, 2002, figs. 147-48