Hope, Henry Radford. Georges Braque, The Museum of Modern Art, New York, in collaboration with the Cleveland Museum of Art, New York, 1949, p.135 (ill. "Io, 1939. Plaster relief, 8-5/8 x 10-3/4. Collection Dr. and Mrs. F. R. Hensel, Indianapolis"; signed at lower left, G Braque (underlined); evidently on of the all-white plaster copies made in 1939 [see Notes]).Fumet, Stanislas. Sculptures de Braque, Paris, 1951, No. 9. (ill. "Io, [here dated] 1935, plâtre"; possibly the plaster original).Russell, John G. Braque, London, 1959, pl. 72 (ill. "THE CHARIOT OF THE SUN, 1953-54"; signed G. Braque at lower left), p.126, no.72 (identifies pl.72 and notes the following: "Le Char du Soleil, 1953-54, Zurich, M.Gustav Zumsteg. Plaster painted in relief, 22 x 27 cm. A reversed composition of the plaster relief of Io of 1939.")Zervos, Christian. Georges Braque: Nouvelles Sculptures et plaques gravées, Paris, [1960?]. pl.XVIII (ill. "Io, plâtre en relief, fond bleu", 20 x 35 [cm.], here dated 1938; evidently one of the painted plaster copies of 1939).