MLA
Janney, James C. Petition of James C. Janney (Hillsboro, Virginia) to Colonel John S. Mosby Asking That Impressed Property Be Restored. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 32. https://digital.library.emory.edu/purl/170msbcd1n-cor.
APA, 6th edition
Janney, J. C. (1864). Petition of James C. Janney (Hillsboro, Virginia) to Colonel John S. Mosby asking that impressed property be restored (Box 5, Folder 32) [Petitions]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcd1n-cor.
Chicago
Janney, James C. “Petition of James C. Janney (Hillsboro, Virginia) to Colonel John S. Mosby Asking That Impressed Property Be Restored.” Petitions. Civil War Collection, 1864. Box 5, Folder 32. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcd1n-cor.