MLA
McKinney, David. Letters from David McKinney to His Family, 1863-1865, and Other Family Letters, 1776-1902. During the Civil War, David McKinney Served as Quartermaster of the 77th Illinois Infantry Regiment (Photocopy). 1776. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 1. https://digital.library.emory.edu/purl/003cz8wbpb-cor.
APA, 6th edition
McKinney, D. (1776). Letters from David McKinney to his family, 1863-1865, and other family letters, 1776-1902. During the Civil War, David McKinney served as quartermaster of the 77th Illinois Infantry Regiment (photocopy) (Box 20, Folder 1) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/003cz8wbpb-cor.
Chicago
McKinney, David. “Letters from David McKinney to His Family, 1863-1865, and Other Family Letters, 1776-1902. During the Civil War, David McKinney Served as Quartermaster of the 77th Illinois Infantry Regiment (Photocopy).” Letters (correspondence). Civil War Collection, 1776. Box 20, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/003cz8wbpb-cor.