MLA
Weaver, Benjamin Putnam. Letter from Captain Benjamin Putnum Weaver (Near Atlanta, Georgia) to His Wife's Father and Mother, Captain Thomas E. and Mrs. Elizabeth Anderson Maguire. Weaver Served in the 42nd Georgia Infantry - August 18, 1864 (Typescript). 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 15. https://digital.library.emory.edu/purl/706g1jwtwk-cor.
APA, 6th edition
Weaver, B. P. (1864). Letter from Captain Benjamin Putnum Weaver (Near Atlanta, Georgia) to his wife's father and mother, Captain Thomas E. and Mrs. Elizabeth Anderson Maguire. Weaver served in the 42nd Georgia Infantry - August 18, 1864 (typescript) (Box 7, Folder 15) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwtwk-cor.
Chicago
Weaver, Benjamin Putnam. “Letter from Captain Benjamin Putnum Weaver (Near Atlanta, Georgia) to His Wife's Father and Mother, Captain Thomas E. and Mrs. Elizabeth Anderson Maguire. Weaver Served in the 42nd Georgia Infantry - August 18, 1864 (Typescript).” Letters (correspondence). Civil War Collection, 1864. Box 7, Folder 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwtwk-cor.