cf. C. Wilk, Thonet: 150 Years of Furniture, Woodbury, New York, 1980, p. 63 for a period illustration of this chair model.
P. Asenbaum et al., Otto Wagner: Möbel und Innenräume, 1984, Salzburg, p. 44, fig. 49 and p. 234, fig. 304 for period illustrations of the chair model in the Board Room of the Austrian Postal Savings Bank from the publication Das Interieur, 1907, pl. 48; and Asenbaum p. 235, fig. 307 for an alternate view of the Board Room.
D. Ostergard, Bent Wood and Metal Furniture 1850-1946, exhibition catalogue, New York, 1987, p. 114, fig. 4-44 and p. 246, cat. no. 46.