MLA
Allgood, Will. Letter from Will Allgood (Camp Ashley) to His Wife, Manday Allgood - May 1, 1862 (Typescript). 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 2. https://digital.library.emory.edu/purl/310jsxktmn-cor.
APA, 6th edition
Allgood, W. (1862). Letter from Will Allgood (Camp Ashley) to his wife, Manday Allgood - May 1, 1862 (typescript) (Box 1, Folder 2) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxktmn-cor.
Chicago
Allgood, Will. “Letter from Will Allgood (Camp Ashley) to His Wife, Manday Allgood - May 1, 1862 (Typescript).” Letters (correspondence). Civil War Collection, 1862. Box 1, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxktmn-cor.