Antonio Morassi. Tiepolo. Bergamo, 1943, p. 48, pl. 125, identifies this painting as a sketch by Giovanni Battista Tiepolo for the ceiling of the Sala della Regina [Saleta] in the Palacio Real, Madrid, datable about 1764–66, and formerly with the Van Diemen Gallery, Berlin.
F[rancisco]. J[avier]. Sánchez Cantón. J. B. Tiepolo en España. Madrid, 1953, pp. 17–18, believes this is later than the other sketch (MMA 37.165.3) for the ceiling of the Saleta.
Antonio Morassi. G. B. Tiepolo: His Life and Work. London, 1955, p. 150, as one of two sketches for the ceiling of the Saleta.
Fritz Neugass. "Sommerlicher Ausklang in New York." Weltkunst 30 (August 15, 1960), p. 6, ill. on cover.
"Aportaciones recientes a la historia del arte español." Archivo español de arte 34, no. 134 (1961), p. 187, under no. 178, pl. III.
Antonio Morassi. A Complete Catalogue of the Paintings of G. B. Tiepolo. London, 1962, pp. 21, 33, 37, fig. 321.
Goya and His Times. Exh. cat., Royal Academy of Arts. London, 1963, p. 5, under no. 6.
Anna Pallucchini in L'opera completa di Giambattista Tiepolo. Milan, 1968, p. 132, no. 279d1, ill. p. 130, as the later of the two sketches, and the true model for the ceiling of the Saleta.
Juan de Contreras, Marqués de Lozoya. "Italian Decorators for the Bourbons." Apollo 87 (May 1968), fig. 7.
Claus Virch. "Dreams of Heaven and Earth: Giambattista and Domenico Tiepolo in the Wrightsman Collection." Apollo 90 (September 1969), pp. 175, 178, fig. 4, dates it about 1764, noting that the fresco is an amalgamation of motifs from both of the sketches.
J[ames]. Byam Shaw. "The Biron Collection of Eighteenth-Century Drawings in the Metropolitan Museum." Metropolitan Museum Journal 3 (1970), p. 239, finds it difficult to determine which sketch came first.
Oil Sketches by 18th Century Italian Artists from New York Collections. Exh. cat., The Metropolitan Museum of Art. [New York], 1971, p. 9, no. 30, believes this work was executed before the other sketch, as the latter shares more details with the fresco.
Federico Zeri with the assistance of Elizabeth E. Gardner. Italian Paintings: A Catalogue of the Collection of The Metropolitan Museum of Art, Venetian School. New York, 1973, p. 59, note that of the two sketches this one is closer to the final fresco.
Everett Fahy in The Wrightsman Collection. Vol. 5, Paintings, Drawings. [New York], 1973, pp. 248–56, no. 26, ill. p. 249 (color), figs. 1–3 (details), finds it impossible to judge which of the two sketches came first.
John Pope-Hennessy in The Metropolitan Museum of Art: Notable Acquisitions, 1980–1981. New York, 1981, pp. 44–45, ill. (color), as a "somewhat later study" than the other one.
Michael Levey. Giambattista Tiepolo: His Life and Art. New Haven, 1986, pp. 263–64, observes that neither of the existing sketches can claim to be in itself the modello and that both sketches may have been submitted to the King as preliminary ideas; notes that this sketch was executed on a larger canvas and that it quotes the image of the puma that appears in Tiepolo's throne room fresco, but not in the Saleta fresco.
Jesús Urrea in Venezia e la Spagna. Milan, 1988, p. 242, fig. 240.
Beverly Louise Brown. Giambattista Tiepolo: Master of the Oil Sketch. Exh. cat., Kimbell Art Museum, Fort Worth. Milan, 1993, pp. 310–12, under no. 56, fig. 150, believes that neither of the sketches served as the explicit modello for the finished fresco, which is the synthesis of motifs in both works; suggests that Tiepolo worked on both sketches simultaneously—as he changed the rectangular format to an oval in both works—and that he presented them to Charles III and his advisors as alternatives to choose between.
Massimo Gemin and Filippo Pedrocco. Giambattista Tiepolo: i dipinti, opera completa. Venice, 1993, pp. 200, 488–89, no. 518b, ill., believe this work was created after the other sketch.
Rodolfo Pallucchini. La pittura nel Veneto: il Settecento. Vol. 1, Milan, 1995, p. 471, calls it the definitive sketch and refers to the other as a first idea.
Keith Christiansen et al. in Giambattista Tiepolo, 1696–1770. Ed. Keith Christiansen. Exh. cat., The Metropolitan Museum of Art. New York, 1996, pp. 286, 328–33, no. 54b. ill. (color) [Italian ed., "Giambattista Tiepolo, 1696–1996," Milan, 1996, pp. 286, 326, 329–33, no. 54b, ill. (color)], comments on the many differences in the secondary figures included in this work and the other sketch, noting that the final ceiling incorporates elements of both, at the same time introducing completely new features; observes that the iconographical program of the Saleta was described in detail by Francisco José Fabre in a guide for King Ferdinand VII in 1829.
Chantal Eschenfelder. Giovanni Battista Tiepolo, 1696–1770. Cologne, 1998, p. 133.
William L. Barcham. "'E chi non potrebbe cantare facilmente Febo?'." Giambattista Tiepolo nel terzo centenario della nascita. Ed. Lionello Puppi. Padua, 1998, vol. 1, pp. 255–56, vol. 2, p. 93, fig. 2, discusses the relative importance Apollo assumes in the two oil sketches and his culminating role in the fresco.
Andrea Kirsh and Rustin S. Levenson. Seeing Through Paintings: Physical Examination in Art Historical Studies. New Haven, 2000, p. 272 n. 6, refer to this work or 37.165.3.
Filippo Pedrocco. Giambattista Tiepolo. Milan, 2002, pp. 305–7, no. 277/2.b, ill.
Everett Fahy in The Wrightsman Pictures. Ed. Everett Fahy. New York, 2005, pp. 96–99, no. 28, ill. (color).
Xavier F. Salomon in Giambattista Tiepolo: "il miglior pittore di Venezia". Ed. Giuseppe Bergamini et al. Exh. cat., Villa Manin di Passariano. Codroipo, 2012, p. 249, under no. 46.
Andrés Úbeda de los Cobos. The Artist at Court: Giandomenico Tiepolo and His Fantasy Portraits. Exh. cat., Museo de Bellas Artes de Bilbao. n.p., 2014, p. 34, fig. 16 (color).