"Fine Arts, 37th Annual Exhibition of the NAD," New York Herald, April 16, 1862. "Fine Arts: The NAD. Third and Concluding Notice," Albion, May 17, 1862, p. 237. J. Hay, "Inklings of Idleness," Washington Sunday Morning Chronicle, April 20, 1862. "The Lounger: The National Academy," Harper's Weekly, May 3, 1862, p. 274. Catalogue of the Paintings, Drawings, Statuary, Etc. of the Art Department in the Great Central Fair, held in Logan Square, June 1864, for the Benefit of the U.S. Sanitary Commission, exhibition catalogue, Philadelphia, Pennsylvania, 1864, p. 7, no. 74 (as Camp Cameron). "Fine Art Sale," The New York Times, May 10, 1870, p. 5 (as Sunday Morning in the Camp of the Seventh Regiment). Artist's notes, transcribed in S.R. Gifford, letter to Rev. O.B. Frothingham, New York, 1874 (as Sunday Morning at Camp Cameron). Seventh Regiment New Armory Fair, Catalogue of the Loan Art Exhibition, Consisting of Choice Examples of the Modern Foreign and American Schools of Painting, Rare Etchings, Engravings, and Other Art Works, New York, 1879, p. 14, no. 146 (as Sunday Morning--Camp Cameron). The Metropolitan Museum of Art, A Memorial Catalogue of the Paintings of Sanford Robinson Gifford, N.A., New York, 1881, p. 24, no. 246 [104] (as Sunday Morning at Camp Cameron, near Washington, in May, 1861). M.G. Van Rensselaer, The American Architect and Building News, vol. XI, no. 320, Boston, Massachusetts, January-June 1882, p. 64 (as Sunday Morning at Camp Cameron). The Metropolitan Museum of Art, Life in America: A Special Loan Exhibition of Paintings Held During the Period of the New York World's Fair, exhibition catalogue, New York, 1939, pp. 138-39, pl. 185, illustrated. H.W. Williams, The Civil War: The Artist's Record, exhibition catalogue, Washington, D.C., 1961, pp. 59, 68, no. 49, illustrated (as Preaching to the Troops). Kennedy Galleries, Inc., The National Academy of Design Exhibition Record, 1861-1900, vol. 2, New York, 1973, p. 340, no. 104. I. Weiss, Sanford Robinson Gifford (1823-1880), Ph.D. dissertation, New York, 1977, pp. 207-09, 215, 430, fig. VII A1, illustrated (as Sunday Morning at Camp Cameron, near Washington, in May, 1861). I. Weiss, Poetic Landscape: The Art and Experience of Sanford R. Gifford, Newark, New Jersey, 1987, pp. 47, 92, 162, 227, 327, illustrated. M. Simpson, Winslow Homer: Paintings of the Civil War, San Francisco, California, 1988, p. 179 (as Sunday Morning at Camp Cameron, Near Washington, in May 1861). S.W. Sears, The Civil War: A Treasury of Art and Literature, New York, 1992, p. 126, pl. 37, illustrated (as Preaching to the Troops). K. Bott, Deutsche Künstler in Amerika, 1813-1913, Weimar, Germany, 1996, p. 388. B.L. Bassham, Conrad Wise Chapman: Artist & Soldier of the Confederacy, Kent, Ohio, 1998, pp. 108-09, fig. 55, illustrated (as Preaching to the Troops, or Sunday Morning at Camp Cameron, near Washington, May, 1861). D.B. Dearinger, A. Berman, Rave Reviews: American Art and Its Critics, 1826-1925, New York, 2000, pp. 201-02, no. 27, illustrated. K.J. Avery, F. Kelly, eds., Hudson River School Visions: The Landscapes of Sanford R. Gifford, New York, 2003, pp. 147, 158, 160, 249. D.W. Hill, ed., An Idler: John Hay's Social and Aesthetic Commentaries for the Press during the Civil War, 1861-1865, Bethesda, Maryland, 2006, p. 76. E.J. Harvey, The Civil War and American Art, exhibition catalogue, Washington, D.C., 2012, pp. 115-18, 120, 295, no. 33, illustrated (as Preaching to the Troops or Sunday Morning at Camp Cameron, near Washington, May 1861).