MLA
Brooks, N. J. Letter from N.J. Brooks (Charlottesville, Virginia) to His Father. Brooks Was a Member of Cobb's Legion - May 15, 1863 [Photograph]. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 37. https://digital.library.emory.edu/purl/395w6m9161-cor.
APA, 6th edition
Brooks, N. J. (1863). Letter from N.J. Brooks (Charlottesville, Virginia) to his father. Brooks was a member of Cobb's Legion - May 15, 1863 [photograph] (Box 1, Folder 37) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/395w6m9161-cor.
Chicago
Brooks, N. J. “Letter from N.J. Brooks (Charlottesville, Virginia) to His Father. Brooks Was a Member of Cobb's Legion - May 15, 1863 [Photograph].” Letters (correspondence). Civil War Collection, 1863. Box 1, Folder 37. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/395w6m9161-cor.