MLA
Wright, Ambrose Ranson. Report from Ambrose Ranson Wright (Headquarters, Wright's Division, Adams Run, South Carolina) of His Operations in the Defense of Savannah, Georgia to T. B. Roy - January 20, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 44. https://digital.library.emory.edu/purl/313zs7h564-cor.
APA, 6th edition
Wright, A. R. (1865). Report from Ambrose Ranson Wright (Headquarters, Wright's Division, Adams Run, South Carolina) of his operations in the defense of Savannah, Georgia to T. B. Roy - January 20, 1865 (Box 7, Folder 44) [Reports]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h564-cor.
Chicago
Wright, Ambrose Ranson. “Report from Ambrose Ranson Wright (Headquarters, Wright's Division, Adams Run, South Carolina) of His Operations in the Defense of Savannah, Georgia to T. B. Roy - January 20, 1865.” Reports. Civil War Collection, 1865. Box 7, Folder 44. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h564-cor.