MLA
Allen, Young John, 1836-1907. Letter from Young John Allen to Yun Ch'i-ho (Nonsan, Korea) - January 16, 1902. January 16, 1902. Yun Ch‘i-ho Papers. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/740ksn044v-cor.
APA, 6th edition
Allen, Young John, 1836-1907. (January 16, 1902)[Letter from Young John Allen to Yun Ch'i-ho (Nonsan, Korea) - January 16, 1902]. Yun Ch‘i-ho Papers, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/740ksn044v-cor.
Chicago
Allen, Young John, 1836-1907, Letter from Young John Allen to Yun Ch'i-ho (Nonsan, Korea) - January 16, 1902, January 16, 1902, Yun Ch‘i-ho Papers, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/740ksn044v-cor.