MLA
Willard, Levi. Letter from J. J. Willard to "My Dear Howard" Donating the Letter Written by Levi Willard to Multon A. Candler to the Emory University Library. J. J. Willard Was Levi Willard's Grandson. 1957. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 9, Folder 47. https://digital.library.emory.edu/purl/0580k6dkjn-cor.
APA, 6th edition
Willard, L. (1957). Letter from J. J. Willard to "My dear Howard" donating the letter written by Levi Willard to Multon A. Candler to the Emory University Library. J. J. Willard was Levi Willard's grandson (Box 9, Folder 47) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0580k6dkjn-cor.
Chicago
Willard, Levi. “Letter from J. J. Willard to ‘My Dear Howard’ Donating the Letter Written by Levi Willard to Multon A. Candler to the Emory University Library. J. J. Willard Was Levi Willard's Grandson.” Letters (correspondence). Civil War Collection, 1957. Box 9, Folder 47. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0580k6dkjn-cor.