MLA
Askew, Thomas E. Portrait of a Man in a Graduation Cap and Gown with a Bow Tie. 1912. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 18. https://digital.library.emory.edu/purl/679573n65f-cor.
APA, 6th edition
Askew, T. E. (1912). Portrait of a man in a graduation cap and gown with a bow tie (Box 18) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/679573n65f-cor.
Chicago
Askew, Thomas E. “Portrait of a Man in a Graduation Cap and Gown with a Bow Tie.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1912. Box 18. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/679573n65f-cor.