MLA
Hart, Henry W. Letter from Richard H. Hart (Carlsbad, New Mexico) to John A. Marks (Memphis, Tennessee) Regarding the Civil War Letters of Henry W. Hart - April, 1976 (Photocopy). 1976. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 32. https://digital.library.emory.edu/purl/706g1jwv13-cor.
APA, 6th edition
Hart, H. W. (1976). Letter from Richard H. Hart (Carlsbad, New Mexico) to John A. Marks (Memphis, Tennessee) regarding the Civil War letters of Henry W. Hart - April, 1976 (photocopy) (Box 19, Folder 32) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwv13-cor.
Chicago
Hart, Henry W. “Letter from Richard H. Hart (Carlsbad, New Mexico) to John A. Marks (Memphis, Tennessee) Regarding the Civil War Letters of Henry W. Hart - April, 1976 (Photocopy).” Letters (correspondence). Civil War Collection, 1976. Box 19, Folder 32. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwv13-cor.