MLA
Ragland, H. D. Letter from H. D. Ragland (Huntersville, Virginia), to John E. Spindle (Camp Johnson, Virginia), Regarding Replacing a Horse. Ragland Served as Wagonmaster to the 44th Virginia Infantry Regiment, Where Spindle Was the Quartermaster - February 28, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 54. https://digital.library.emory.edu/purl/535t76hfsz-cor.
APA, 6th edition
Ragland, H. D. (1862). Letter from H. D. Ragland (Huntersville, Virginia), to John E. Spindle (Camp Johnson, Virginia), regarding replacing a horse. Ragland served as Wagonmaster to the 44th Virginia Infantry Regiment, where Spindle was the Quartermaster - February 28, 1862 (Box 5, Folder 54) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/535t76hfsz-cor.
Chicago
Ragland, H. D. “Letter from H. D. Ragland (Huntersville, Virginia), to John E. Spindle (Camp Johnson, Virginia), Regarding Replacing a Horse. Ragland Served as Wagonmaster to the 44th Virginia Infantry Regiment, Where Spindle Was the Quartermaster - February 28, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 5, Folder 54. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/535t76hfsz-cor.