MLA
Spencer, Thomas. Maine Monument in Salisbury, North Carolina. Dedicated in 1908, the Monument Honors Maine Union Soldiers Who Died at Salisbury Prison. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 5. https://digital.library.emory.edu/purl/726xwdbt1d-cor.
APA, 6th edition
Spencer, T. (1940). Maine Monument in Salisbury, North Carolina. Dedicated in 1908, the monument honors Maine Union soldiers who died at Salisbury prison (Box 15, Folder 5) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbt1d-cor.
Chicago
Spencer, Thomas. “Maine Monument in Salisbury, North Carolina. Dedicated in 1908, the Monument Honors Maine Union Soldiers Who Died at Salisbury Prison.” Black-and-white photographs. Civil War Collection, 1940. Box 15, Folder 5. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbt1d-cor.