Letter from R. Magritte to L. Scutenaire, June 1950. Letter from R. Magritte to A. Iolas, 17 August 1950. P. Waldberg, René Magritte, Brussels, 1965, p. 52 (illustrated). I. Clurman, Surrealism and the Painting of Matta and Magritte, Stanford, California, 1970, p. 16. R. Passeron, René Magritte, Paris, 1970, p. 36 (illustrated). A. Robbe-Grillet & R. Magritte, La belle captive, Brussels, 1975, p. 134 (illustrated). H. Torczyner, Magritte: Ideas and Images, New York, 1977, no. 440, p. 199 (illustrated). H. Torczyner, L'ami Magritte: correspondance et souvenirs, Antwerp, 1992, pp. 58, 171 & 234 (illustrated p. 32). F. Robinson, The Man in the Bowler Hat, Chapel Hill and London,. 1993, no. 46, p. 143 (illustrated). D. Sylvester, ed., S. Whitfield & M. Raeburn, René Magritte, Catalogue Raisonné, London, 1993, vol. III, no. 724, p. 158 (illustrated). R. Magritte, Magritte/Torczyner: Letters Between Friends, New York, 1994, p. 79 (illustrated).