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Bulletin of the DMA 9, 2 (1915): p. 14 (ill.).
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Bond, John W. “Augustus Saint-Gaudens: The Man and His Art.” Manuscript, Office of Archaeology and Historic Preservation, National Park Service, Washington, D.C., 1968, p. 78.
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Tolles, Thayer. American Sculpture in the Metropolitan Museum of Art, Vol. 1: A Catalogue of Works by Artists Born before 1865. New York, 2001, pp. 276-278, no. 119 (ill. example of MMA version in marble).