MLA
Scott, William H. (William Henry), 1848-1910. Letter from William H. Scott, Sr., circa 1890. 1890 approx.. William H. Scott Family Papers, 1848-1982. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0752fqz7g4-cor.
APA, 6th edition
Scott, William H. (William Henry), 1848-1910. (1890 approx.)[Letter from William H. Scott, Sr., circa 1890]. William H. Scott Family Papers, 1848-1982, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0752fqz7g4-cor.
Chicago
Scott, William H. (William Henry), 1848-1910, Letter from William H. Scott, Sr., circa 1890, 1890 approx., William H. Scott Family Papers, 1848-1982, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0752fqz7g4-cor.