MLA
Scott, James M. List of Abbreviations Contained in the General Order No. 7, Office of the Signal Officer, Washington D. C. (Photocopy). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 20. https://digital.library.emory.edu/purl/146qz613q7-cor.
APA, 6th edition
Scott, J. M. (1863). List of abbreviations contained in the General Order No. 7, Office of the Signal Officer, Washington D. C. (photocopy) (Box 20, Folder 20) [Orders (military records)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/146qz613q7-cor.
Chicago
Scott, James M. “List of Abbreviations Contained in the General Order No. 7, Office of the Signal Officer, Washington D. C. (Photocopy).” Orders (military records). Civil War Collection, 1863. Box 20, Folder 20. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/146qz613q7-cor.