Private collection, Belgium
Friederike Mehlau-Wiebking, Arthur Rüegg and Ruggero Tropeano, Schweizer Typenmöbel 1925-1935: Sigfried Giedion und die Wohnbedarf AG, Zurich, 1989, p. 89, fig. 41, p. 165
Otakar Máčel, 2100 Metal Tubular Chairs, Rotterdam, 2006, p. 64, p. 124 for the armchair example
Alexander von Vegesack and Mathias Schwartz-Clauss, eds., The Essence of Things: Design and the Art of Reduction, exh. cat., Weil am Rhein, 2010, p. 74, cat. 92