MLA
Scott, Irene. Letter to June from Irene Scott, December 9, 1896. 1896. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 1. https://digital.library.emory.edu/purl/6386hdr98v-cor.
APA, 6th edition
Scott, I. (1896). Letter to June from Irene Scott, December 9, 1896 (Box 1, Folder 1) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr98v-cor.
Chicago
Scott, Irene. “Letter to June from Irene Scott, December 9, 1896.” Letters (correspondence). William H. Scott Family Papers, 1848-1982, 1896. Box 1, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr98v-cor.