MLA
Watkins, Benjamin Templeton. Correspondance from Benjamin T. Watkins - June 1838. 1838. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 4. https://digital.library.emory.edu/purl/941zcrjg8m-cor.
APA, 6th edition
Watkins, B. T. (1838). Correspondance from Benjamin T. Watkins - June 1838 (Box 1, Folder 4) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/941zcrjg8m-cor.
Chicago
Watkins, Benjamin Templeton. “Correspondance from Benjamin T. Watkins - June 1838.” Letters (correspondence). Benjamin T. Watkins Family Papers, 1838. Box 1, Folder 4. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/941zcrjg8m-cor.