MLA
Weaver, Claudia. Letter from Claudia Weaver to David E. Estes, Head of Special Collections at Emory Libraries, Regarding Letters Written by Her Grandfather, Captain Benhamin Putnam Weaver, as Well as the Weaver Family Bible. 1964. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 15. https://digital.library.emory.edu/purl/3655dv42q7-cor.
APA, 6th edition
Weaver, C. (1964). Letter from Claudia Weaver to David E. Estes, Head of Special Collections at Emory Libraries, regarding letters written by her grandfather, Captain Benhamin Putnam Weaver, as well as the Weaver family bible (Box 7, Folder 15) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3655dv42q7-cor.
Chicago
Weaver, Claudia. “Letter from Claudia Weaver to David E. Estes, Head of Special Collections at Emory Libraries, Regarding Letters Written by Her Grandfather, Captain Benhamin Putnam Weaver, as Well as the Weaver Family Bible.” Letters (correspondence). Civil War Collection, 1964. Box 7, Folder 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3655dv42q7-cor.