J. Cladel, Auguste Rodin: L'oeuvre et l'homme , Brussels, 1908, p. 161 (marble version illustrated, p. 32).
C. Mauclair, Auguste Rodin: The Man, His Ideas, His Works , London, 1909, p. 12 (another version illustrated).
L. Bénédite, Rodin , Paris, 1924, pp. 26-27 (another version illustrated).
J. Cladel, Auguste Rodin: Sa vie glorieuse, sa vie inconnue , Paris, 1936, pp. 142-43.
G. Grappe, Catalogue du Musée Rodin , Paris, 1944, p. 28, nos. 65-67 (plaster version illustrated).
A.E. Elsen, Rodin , New York, 1963, pp. 39, 49, 151, 192 and 208 (other versions illustrated).
R. Descharnes and J.-F. Chabrun, Auguste Rodin , Paris, 1967, p. 160.
I. Jianou and C. Goldscheider, Rodin , Paris, 1967, p. 90 (plaster version illustrated, pl. 17).
J.L. Tancock, The Sculpture of Auguste Rodin: The Collection of the Rodin Museum, Philadelphia , Philadelphia , 1976, pp. 148-157 (other bronze versions illustrated, fig. 8-7).
N. Barbier, Marbres de Rodin: Collection du Musée , Paris, 1987, p. 198, no. 85 (marble version illustrated, p. 199).
A. Le Normand-Romain, Rodin, La porte de l'enfer , Paris, 1999, p. 45 (other bronze versions illustrated).
A.E. Elsen, Rodin's Art; The Rodin Collection of the Iris & B. Gerald Cantor Center for Visual Arts at Stanford University , New York, 2003, pp. 187-191, no. 41 (other bronze and plaster versions illustrated, pp. 187-189).
A. Le Normand-Romain, The Bronzes of Rodin: Catalogue of the Works in the Musée Rodin , Paris, 2007, vol. I, pp. 339-343 (other bronze versions illustrated, p. 340).