MLA
Library Special Collections - Print Portrait of Emory President Augustus Longstreet. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 10, Folder 12. https://digital.library.emory.edu/purl/197xksn0s3-cor.
APA, 6th edition
Library Special Collections - Print portrait of Emory President Augustus Longstreet (Box 10, Folder 12). [Paintings (visual works)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0s3-cor.
Chicago
“Library Special Collections - Print Portrait of Emory President Augustus Longstreet.” Paintings (visual works). EU Office of Alumni Publications Photos Deposit Collection 1, n.d. Box 10, Folder 12. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0s3-cor.