MLA
Letters from Nelson I. Packard, Assistant Surgeon with the 11th Michigan Infantry Regiment -1863 (Photocopy). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 6. https://digital.library.emory.edu/purl/8773tx971z-cor.
APA, 6th edition
Letters from Nelson I. Packard, assistant surgeon with the 11th Michigan Infantry Regiment -1863 (photocopy) (Box 20, Folder 6). (1863). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8773tx971z-cor.
Chicago
“Letters from Nelson I. Packard, Assistant Surgeon with the 11th Michigan Infantry Regiment -1863 (Photocopy).” Letters (correspondence). Civil War Collection, 1863. Box 20, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8773tx971z-cor.