Juan Gris. Letter to Maurice Raynal. April 30, 1921 [English transl. published in Ref. Cooper 1956, pp. 114–16, no. CXXXII; Spanish transl. published in Ref. Jiménez Blanco 2008, pp. 328–30, no. 331].Daniel Henry Kahnweiler. Juan Gris: His Life and Work. New York, 1947, p. 83.Douglas Cooper. Juan Gris ou le goût du solennel. Geneva, 1949, unpaginated.Douglas Cooper, ed. Letters of Juan Gris [1913–1927]. London, 1956, p. 115 n. 1.John Richardson in Juan Gris. Exh. cat., Museum am Ostwall, Dortmund., 1965, unpaginated, no. 4, ill.Jean Leymarie in Juan Gris. Exh. cat., Orangerie des Tuileries. Paris, 1974, p. 10.Michèle Richet and Claudie Judrin in Juan Gris. Exh. cat., Orangerie des Tuileries. Paris, 1974, pp. 76, 115, no. 7, ill. Juan Antonio Gaya-Nuño. Juan Gris. Boston, 1975, p. 244, no. 33, ill. p. 18.Douglas Cooper with Margaret Potter. Juan Gris: Catalogue raisonné de l'oeuvre peint. Paris, 1977, vol. 1, pp. XIII, 10–11, no. 5, ill.; vol. 2, ill. p. 469 (installation photo). Mark Rosenthal. Juan Gris. Exh. cat., University Art Museum, University of California, Berkeley. New York, 1983, p. 19. Juan Antonio Gaya Nuño. Juan Gris. New York, 1986, colorpl. 21.Maria Grazia Messina and Jolanda Nigro Covre. Il cubismo dei cubisti: Ortodossi/ eretici a Parigi intorno al 1912. Rome, 1986, pp. 346–48, 423, fig. 158. John Golding. Cubism: A History and an Analysis 1907–1914. 3rd rev. ed. (1st ed., 1959; 2nd ed. 1968). Cambridge, Mass., 1988, p. 100, pl. 57 ( 1959 ed., p. 99, pl. 41; 1968 ed., p. 99, pl. 48).William S. Lieberman in Twentieth Century Modern Masters: The Jacques and Natasha Gelman Collection. Ed. William S Lieberman. Exh. cat., The Metropolitan Museum of Art. New York, 1989, p. 13.Sabine Rewald in Twentieth Century Modern Masters: The Jacques and Natasha Gelman Collection. Ed. William S Lieberman. Exh. cat., The Metropolitan Museum of Art. New York, 1989, pp. 108–10, 301, ill. (color and bw). Gary Tinterow in Twentieth Century Modern Masters: The Jacques and Natasha Gelman Collection. Ed. William S Lieberman. Exh. cat., The Metropolitan Museum of Art. New York, 1989, p. 35.Roberta Smith. "In a Brash Yet Refined School, Everyone Belongs Together." New York Times (June 15, 2001), p. E37. Paloma Esteban Leal in Juan Gris: Paintings and Drawings 1910–1927. Ed. Paloma Esteban Leal. Exh. cat., Museo Nacional Centro de Arte Reina Sofía. Madrid, 2005, vol. 1, p. 32, colorpl. 5; vol. 2, p. 13, no. 5, ill. María Dolores Jiménez-Blanco, ed. Juan Gris: Correspondencia y escritos. Barcelona, 2008, p. 329 n. 527, p. 502.García Ponce de Léon. Juan Gris: La pasión por el Cubismo. Madrid, 2008, p. 210, ill. p. 208 (color).Juan Manuel Bonet in Juan Gris. Exh. cat., Galería de Arte Manuel Barbié. [Barcelona], 2010, pp. 31–32, 52, 77–82, ill. pp. 33 (color), 81.