G. Grappe, Catalogue du Musée Rodin, Paris, 1927, no. 114, p. 52 (another cast illustrated p. 53; titled ‘Bourgeois à la clé’). A.T. Spear, Rodin Sculpture in the Cleveland Museum of Art, Cleveland, 1967, no. VIII, p. 95 (another cast illustrated pl. 61). I. Jianou & C. Goldscheider, Rodin, Paris, 1967, p. 98 (the monumental bronze version illustrated pls. 39 & 41). A.T. Spear, Rodin Sculpture in the Cleveland Museum of Art, a Supplement, Cleveland, 1974, p. 128 (illustrated). J.L. Tancock, The Sculpture of Auguste Rodin, Philadelphia, 1976, no. 67-69-13, p. 399 (another cast illustrated p. 390). C. Judrin, M. Laurent & D. Viéville, exh. cat., Auguste Rodin: Le monument des Bourgeois de Calais (1884-1895), Paris & Calais, 1977, no. 88, p. 224 (another cast illustrated). A. Le Normand-Romain, The Bronzes of Rodin, Catalogue of the Works in the Musée Rodin, vol. I, Paris, 2007, no. S. 757, p. 220 (another cast illustrated).