MLA
General Order No. 3 under the Command of Confederate Major General Robert E. Lee. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 57. https://digital.library.emory.edu/purl/99351c5bp4-cor.
APA, 6th edition
General Order No. 3 under the command of Confederate Major General Robert E. Lee (Box 6, Folder 57). (1861). [Orders (military records)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5bp4-cor.
Chicago
“General Order No. 3 under the Command of Confederate Major General Robert E. Lee.” Orders (military records). Civil War Collection, 1861. Box 6, Folder 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5bp4-cor.