MLA
Wright, Marcus J. (Marcus Joseph), 1831-1922. Letter from General Marcus J. Wright (Washington, D.C.) to General William E. Mickle, regarding distribution of various reports, etc. relating to the United Confederate Veterans - April 4, 1904. April 4, 1904. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/781jh9w1xm-cor.
APA, 6th edition
Wright, Marcus J. (Marcus Joseph), 1831-1922. (April 4, 1904)[Letter from General Marcus J. Wright (Washington, D.C.) to General William E. Mickle, regarding distribution of various reports, etc. relating to the United Confederate Veterans - April 4, 1904]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/781jh9w1xm-cor.
Chicago
Wright, Marcus J. (Marcus Joseph), 1831-1922, Letter from General Marcus J. Wright (Washington, D.C.) to General William E. Mickle, regarding distribution of various reports, etc. relating to the United Confederate Veterans - April 4, 1904, April 4, 1904, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/781jh9w1xm-cor.