MLA
Parker, F. H. Instructions from Lieutenant F. H. Parker (Vicksburg, Mississippi) Chief of Ordinance, Department of Tennessee, While He Is Away - September 19, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 7. https://digital.library.emory.edu/purl/310jsxktsj-cor.
APA, 6th edition
Parker, F. H. (1863). Instructions from Lieutenant F. H. Parker (Vicksburg, Mississippi) Chief of Ordinance, Department of Tennessee, while he is away - September 19, 1863 (Box 20, Folder 7) [Orders (military records)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxktsj-cor.
Chicago
Parker, F. H. “Instructions from Lieutenant F. H. Parker (Vicksburg, Mississippi) Chief of Ordinance, Department of Tennessee, While He Is Away - September 19, 1863.” Orders (military records). Civil War Collection, 1863. Box 20, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxktsj-cor.