MLA
Letter from C. F. Reid to Yun Ch'i-Ho Regarding the Songdo School and Hospital - October 1, 1908. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 3. https://digital.library.emory.edu/purl/880ht76jps-cor.
APA, 6th edition
Letter from C. F. Reid to Yun Ch'i-ho regarding the Songdo school and hospital - October 1, 1908 (Box 17, Folder 3). (1908). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76jps-cor.
Chicago
“Letter from C. F. Reid to Yun Ch'i-Ho Regarding the Songdo School and Hospital - October 1, 1908.” Letters (correspondence). Yun Ch‘i-Ho Papers, 1908. Box 17, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76jps-cor.