MLA
Philips, E. Letter from E. Philips (Goldsboro, North Carolina) to Miss Ann Bright - May 18, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 45. https://digital.library.emory.edu/purl/518rbnzt99-cor.
APA, 6th edition
Philips, E. (1862). Letter from E. Philips (Goldsboro, North Carolina) to Miss Ann Bright - May 18, 1862 (Box 5, Folder 45) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/518rbnzt99-cor.
Chicago
Philips, E. “Letter from E. Philips (Goldsboro, North Carolina) to Miss Ann Bright - May 18, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 5, Folder 45. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/518rbnzt99-cor.