MLA
Letter Written and Signed by Ten Union Prisoners at Camp Sumter (Andersonville, Georgia) to Lieutenant S. M. Mayes, 2nd Georgia Infantry Regiment, to Accompany a Watch They Gave Him in Appreciation for His Conduct - September 20, 1864 (Photocopy). 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 62. https://digital.library.emory.edu/purl/095j9kd63q-cor.
APA, 6th edition
Letter written and signed by ten Union prisoners at Camp Sumter (Andersonville, Georgia) to Lieutenant S. M. Mayes, 2nd Georgia Infantry Regiment, to accompany a watch they gave him in appreciation for his conduct - September 20, 1864 (photocopy) (Box 4, Folder 62). (1864). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/095j9kd63q-cor.
Chicago
“Letter Written and Signed by Ten Union Prisoners at Camp Sumter (Andersonville, Georgia) to Lieutenant S. M. Mayes, 2nd Georgia Infantry Regiment, to Accompany a Watch They Gave Him in Appreciation for His Conduct - September 20, 1864 (Photocopy).” Letters (correspondence). Civil War Collection, 1864. Box 4, Folder 62. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/095j9kd63q-cor.