MLA
Scott, Frances S. Letter from Frances S. Scott to W. F. Stribling (Fredericksburg, Virginia) Inquiring about the Health of Her Son Hugh - March 26, [No Year]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 37. https://digital.library.emory.edu/purl/416c2fqzvq-cor.
APA, 6th edition
Scott, F. S. Letter from Frances S. Scott to W. F. Stribling (Fredericksburg, Virginia) inquiring about the health of her son Hugh - March 26, [no year] (Box 6, Folder 37) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fqzvq-cor.
Chicago
Scott, Frances S. “Letter from Frances S. Scott to W. F. Stribling (Fredericksburg, Virginia) Inquiring about the Health of Her Son Hugh - March 26, [No Year].” Letters (correspondence). Civil War Collection, n.d. Box 6, Folder 37. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fqzvq-cor.