J.L. Tancock, The Sculpture of Auguste Rodin, Philadelphia, 1976, pp. 176-180, nos. 14-16. (other variants illustrated).,J. de Caso and P.B. Sanders, Rodin's Sculpture, A critical study of the Spreckels Collection, California Palace of the Legion of Honor, San Francisco, 1977, nos. pp. 184-189, 30-32 (other variants illustrated).,A. Lajoix, 'Auguste Rodin et les arts du feu', Revue de l'art, 1997 (CXVI), pp. 82-83 (another variant illustrated).,A. Le Normand-Romain in A. Le Normand-Romain (ed.), Rodin en 1900. L'exposition d'Alma, exhib. cat., Paris, Musée Rodin, 2001, no. 16 and p. 67 (another variant illustrated).,A. Le Normand-Romain, Rodin. Le Porte de l'Enfer, Paris, 2002, pp. 50-51.,M.-P. Delclaux, Eclats de vie, Paris, 2003, p. 59 (another variant illustrated).,A.E. Elsen in A.E. Elsen (ed.), Rodin's Art: The Rodin Collection of the Iris and B. Gerald Cantor Center for Visual Arts at Stanford University, New York, 2003, nos. 58-59 (other variants illustrated).,A. Le Normand-Romain, The Bronzes of Rodin: Catalogue of Works in the Musée Rodin, Paris, 2007, vol. II, pp. 596-598 (other variants illustrated)