MLA
Zimmer, Louis. The 3d Kentucky (CSA) at Mess before Corinth, Mississippi, May 11, 1862. Lithograph Based on Painting by Conrad Wise Chapman. 1871. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP28, Folder 2. https://digital.library.emory.edu/purl/354xgxd3br-cor.
APA, 6th edition
Zimmer, L. (1871). The 3d Kentucky (CSA) at mess before Corinth, Mississippi, May 11, 1862. Lithograph based on painting by Conrad Wise Chapman (OP28, Folder 2) [Lithographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/354xgxd3br-cor.
Chicago
Zimmer, Louis. “The 3d Kentucky (CSA) at Mess before Corinth, Mississippi, May 11, 1862. Lithograph Based on Painting by Conrad Wise Chapman.” Lithographs. Civil War Collection, 1871. OP28, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/354xgxd3br-cor.