MLA
Bulkley, H. D. Letter from H. D. Bulkley to Captain William M. Tunno - March 11, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 57. https://digital.library.emory.edu/purl/986b2rbpnx-cor.
APA, 6th edition
Bulkley, H. D. (1865). Letter from H. D. Bulkley to Captain William M. Tunno - March 11, 1865 (Box 6, Folder 57) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbpnx-cor.
Chicago
Bulkley, H. D. “Letter from H. D. Bulkley to Captain William M. Tunno - March 11, 1865.” Letters (correspondence). Civil War Collection, 1865. Box 6, Folder 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbpnx-cor.