MLA
Tompkins, Sally Louisa, 1833-1916. Letter from Sally L. Tompkins (Richmond, Virginia) to William Berrien Borroughs - September 27, 1907. September 27, 1907. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfqx-cor.
APA, 6th edition
Tompkins, Sally Louisa, 1833-1916. (September 27, 1907)[Letter from Sally L. Tompkins (Richmond, Virginia) to William Berrien Borroughs - September 27, 1907]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfqx-cor.
Chicago
Tompkins, Sally Louisa, 1833-1916, Letter from Sally L. Tompkins (Richmond, Virginia) to William Berrien Borroughs - September 27, 1907, September 27, 1907, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfqx-cor.