Georges Grappe, Catalogue du Musée Rodin, Paris, 1929, nos. 167-69, another cast illustrated pp. 73-74 Henri Martinie, Auguste Rodin, Paris, 1949, no. 19, another cast illustrated Albert E. Elsen, Rodin, New York, 1963, another cast illustrated pp. 25, 52 & 53 Ionel Jianou & Cécile Goldscheider, Rodin, Paris, 1967, another cast illustrated pl. 11 John L. Tancock, The Sculpture of Auguste Rodin, Philadelphia, 1976, another cast illustrated pp. 111-20 Albert E. Elsen, (ed.), Rodin Rediscovered, Washington, D. C., 1981, the plaster model illustrated p. 67 Albert E. Elsen, The Gates of Hell by Auguste Rodin, Stanford, 1985, figs. 50 & 60, illustrations of the clay model pp. 56 & 71 Antoinette le Normand-Romain (ed.), The Bronzes of Rodin, Catalogue of works in the Musée Rodin, Paris, 2007, vol. II, another cast illustrated pp. 584-85