Alfred Robaut. L'Œuvre de Corot: Catalogue raisonné et illustré. [reprint 1965]. Paris, 1905, vol. 2, pp. 62–63, no. 173, ill., as "Cività Castellana.—Plateaux sur les montagnes," dated 1826–27; illustrated by Robaut's drawing after the painting, presumably made in 1878, at the collector Bardon's.
André Jullien and Renée Jullien. "Les campagnes de Corot au nord du Rome (1826–1827)." Gazette des beaux-arts, 6th ser., 99 (May–June 1982), pp. 190, 198 n. 32.
Cara Dufour Denison in The Thaw Collection: Master Drawings and Oil Sketches, Acquisitions Since 1994. Exh. cat., Pierpont Morgan Library. New York, 2002, pp. 196–97, no. 90, ill. (color), as "Cività Castellana plateaux sur les montagnes"; notes this sketch's similarity to another one made nearby (Phillips Collection, Washington; Robaut 1905, no. 142); mistakenly conjectures that dedicatee named in inscription was the painter Théodore Bardon (French, active 1839–48).
Charlotte Gere in Plein-Air Painting in Europe, 1780–1850. Exh. cat., Shizuoka Prefectural Museum of Art. Shizuoka, 2004, p. 83, no. 36, ill. (color), as "View of the plateaux of Cività Castellana [Cività Castellana plateaux sur les montagnes]"; describes it as "one of the most fleeting and abstract" oil sketches made by Corot at Cività Castellana in May 1826 and autumn 1827.
Esther Bell. "Catalogue Raisonné of the Thaw Collection." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, p. 112, no. 31, ill. (color), calls it "Landscape at Cività Castellana" and dates it 1826 or 1827.