MLA
Letter from E. H. Farley to Yun Ch'i-Ho[?] - 1910. 1910. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 3. https://digital.library.emory.edu/purl/791sf7m1mz-cor.
APA, 6th edition
Letter from E. H. Farley to Yun Ch'i-ho[?] - 1910 (Box 17, Folder 3). (1910). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m1mz-cor.
Chicago
“Letter from E. H. Farley to Yun Ch'i-Ho[?] - 1910.” Letters (correspondence). Yun Ch‘i-Ho Papers, 1910. Box 17, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m1mz-cor.