lower right in plate: Homer; lower center: THE ARMY OF THE POTOMAC-A SHARP-SHOOTER ON PICKET DUTY.-[From a Painting by W. Homer, Esq.]
- Winslow Homer in the National Gallery of Art, National Gallery of Art, Washington, D.C., 2005-2006, unnumbered brochure, fig. 1.
- Foster, Allen Evarts. "A check list of illustrations by Winslow Homer in 'Harper's Weekly' and other periodicals." Bulletin of the New York Public Library 40 (1936): 842-852. Separately published New York: New York Public Library, 1936.
- Gelman 1969, no.135.
- Kelsey 1977, no.119.