Georges Grappe, Catalogue du Musée Rodin, Paris, 1927, nos. 91-92, marble version illustrated p. 47. Georges Grappe, Le Musée Rodin, Paris, 1947, p. 142, marble version illustrated pl. 71. Cécile Goldscheider, Rodin: sa vie, son oeuvre, son héritage, Paris, 1962, marble version illustrated n.p. Albert E. Elsen , Rodin, New York, 1963, pp. 62 & 63, another example illustrated p. 63. Ionel Jianou & Cécile Goldscheider, Rodin, Paris, 1967, p. 100, marble version illustrated pls. 54 & 55. Robert Descharnes & Jean-François Chabrun, Auguste Rodin, London, 1967, p. 130, marble version illustrated p. 131. Cécile Goldscheider, Rodin Sculptures, London, 1970, marble version illustrated no. 49. John L. Tancock, The Sculpture of Auguste Rodin, Philadelphia, 1976, pp. 72, 90 & 108, marble version illustrated p. 77. Rainer Maria Rilke, Rodin, Salt Lake City, 1979, pp. 38 & 104, another example illustrated p. 39. Albert E. Elsen, The Gates of Hell by Auguste Rodin, Stanford, 1985, p. 78, another example illustrated p. 79. Antoinette Le Normand-Romain, Le Baiser de Rodin, Paris, 1995, another example illustrated . Jacques Vilain, Rodin at the Musée Rodin, Paris, 1999, marble version illustrated p. 39. Raphael Masson & Véronique Mattiussi, Rodin, Paris, 2004, p. 40, marble version illustrated p. 41. Antoinette Le Normand-Romain, The Bronzes of Rodin, Catalogue of Works in the Museé Rodin, vol. I, Paris, 2007, another example illustrated p. 161