Acquired directly from the artist by the present owner, circa 1971
Fulvio Ferrari, Ettore Sottsass Tutta la Ceramica, Turin, 1996, p. 170
Fulvio Ferrari, Sottsass: 1000 Ceramics, Turin, 2017, p. 147
Ivan Mietton, Sottsass: Poltronova 1958-1975, Paris, 2021, p. 199