MLA
Robinson, George. Letter from George Robinson to Green B. Woody from George Robinson. Woody Served in Company C of the 58th North Carolina Infantry Regiment - May 3, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 41. https://digital.library.emory.edu/purl/4988gthv6x-cor.
APA, 6th edition
Robinson, G. (1863). Letter from George Robinson to Green B. Woody from George Robinson. Woody served in Company C of the 58th North Carolina Infantry Regiment - May 3, 1863 (Box 7, Folder 41) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4988gthv6x-cor.
Chicago
Robinson, George. “Letter from George Robinson to Green B. Woody from George Robinson. Woody Served in Company C of the 58th North Carolina Infantry Regiment - May 3, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 7, Folder 41. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4988gthv6x-cor.