MLA
O'Neill, John A., approximately 1836-. Union admiral Andrew Foote. 1861?/1880?. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/624jm64001-cor.
APA, 6th edition
O'Neill, John A., approximately 1836-. (1861?/1880?)[Union admiral Andrew Foote]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/624jm64001-cor.
Chicago
O'Neill, John A., approximately 1836-, Union admiral Andrew Foote, 1861?/1880?, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/624jm64001-cor.