cf. D. Baroni and A. D'Auria, Josef Hoffmann et la Wiener Werkstätte, Milan, 1981, p. 30 for an image of a similar cabinet with three shelves and slightly different details in the glass panels.
D. E. Ostergard, Bentwood and Metal Furniture: 1850-1946, New York, 1987, p. 110, fig. 4-34 for an image of a similar cabinet as seen in a 1906 special edition of Studio Yearbook.