Private collection, Copenhagen
Tina Jørstian and Poul Erik Munk Nielsen, PH 100 Light&Design, exh. cat., Danish Museum of Art & Design, Copenhagen, 1994, p. 14
Tina Jørstian and Poul Erik Munk Nielsen, eds., Light Years Ahead, The Story of the PH Lamp, Copenhagen, 2000, p. 186