MLA
Townsend, E. D. Special Order No. 405 given by the United States War Department; Adjutant General's Office, Honorably Discharges Private Wilbur F. Du Bois, of the 20th Michigan Infantry Regiment, to Allow Him to Accept Appointment in the United States Army Colored Troops - November 18, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 38. https://digital.library.emory.edu/purl/863fxpnx2x-cor.
APA, 6th edition
Townsend, E. D. (1864). Special Order No. 405 given by the United States War Department; Adjutant General's Office, honorably discharges Private Wilbur F. Du Bois, of the 20th Michigan Infantry Regiment, to allow him to accept appointment in the United States Army Colored Troops - November 18, 1864 (Box 20, Folder 38) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/863fxpnx2x-cor.
Chicago
Townsend, E. D. “Special Order No. 405 given by the United States War Department; Adjutant General's Office, Honorably Discharges Private Wilbur F. Du Bois, of the 20th Michigan Infantry Regiment, to Allow Him to Accept Appointment in the United States Army Colored Troops - November 18, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 20, Folder 38. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/863fxpnx2x-cor.