MLA
Brothers, Calvert. Portrait of Confederate General Felix Zollicoffer. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP6, Folder 10. https://digital.library.emory.edu/purl/552w3r23gx-cor.
APA, 6th edition
Brothers, C. (1862). Portrait of Confederate General Felix Zollicoffer (OP6, Folder 10) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/552w3r23gx-cor.
Chicago
Brothers, Calvert. “Portrait of Confederate General Felix Zollicoffer.” Black-and-white photographs. Civil War Collection. Nashville, TN, 1862. OP6, Folder 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/552w3r23gx-cor.