MLA
Mangum, A. W. (Adolphus Williamson), 1834-1890. Myrtle leaves, or, Tokens at the tomb. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v7197-cor.
APA, 6th edition
Mangum, A. W. (Adolphus Williamson), 1834-1890. (1864)[Myrtle leaves, or, Tokens at the tomb, 2nd edition (revised and enlarged).]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v7197-cor.
Chicago
Mangum, A. W. (Adolphus Williamson), 1834-1890, Myrtle leaves, or, Tokens at the tomb, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v7197-cor.