Georges Grappe, Catalogue du Musée Rodin, Paris, 1927, illustrations of other versions p. 42; Georges Grappe, Catalogue du Musée Rodin, Paris, 1944, illustration of a marble version p. 56; Bernard Champigneulle, Rodin, London, 1967, illustration of a larger bronze pp. 92-3; Robert Descharnes & Jean-François Chabrun, Auguste Rodin, Lausanne, 1967, illustration of a larger bronze pls. 56-57; Ionel Jianou & Cécile Goldscheider, Rodin, Paris, 1967, illustration of a smaller bronze pls. 56-57; John L. Tancock, The Sculpture of Auguste Rodin, Philadelphia, 1976, illustration of the plaster on the cover, pp. 22 & 242; illustration of a larger bronze p. 243; Albert E. Elsen, Rodin's Art, The Rodin Collection, Iris & B. Gerald Cantor Center for Visual Arts at Stanford University, New York, 2003, illustrations of a smaller bronze pp. 494-5; illustrations of a larger bronze p. 496; Antoinette Le Normand-Romain, The Bronzes of Rodin, Catalogue of Works in the Musée Rodin, vol. I, Paris, 2007, no. S.2473, illustration of another cast p. 332; illustrations of other bronzes, marbles & plasters pp. 331-37