MLA
Allen, Young John, 1836-1907. Letter from Young John Allen to Yun Ch'i-ho (Seoul, Korea) - July 18, 1905. July 18, 1905. Yun Ch‘i-ho Papers. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/955m905rr4-cor.
APA, 6th edition
Allen, Young John, 1836-1907. (July 18, 1905)[Letter from Young John Allen to Yun Ch'i-ho (Seoul, Korea) - July 18, 1905]. Yun Ch‘i-ho Papers, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/955m905rr4-cor.
Chicago
Allen, Young John, 1836-1907, Letter from Young John Allen to Yun Ch'i-ho (Seoul, Korea) - July 18, 1905, July 18, 1905, Yun Ch‘i-ho Papers, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/955m905rr4-cor.