MLA
Bros., Alexander. Group Shot of Two Teachers and Students Sitting. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 11. https://digital.library.emory.edu/purl/221tdz08sf-cor.
APA, 6th edition
Bros., A. Group shot of two teachers and students sitting (Box 11) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/221tdz08sf-cor.
Chicago
Bros., Alexander. “Group Shot of Two Teachers and Students Sitting.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/221tdz08sf-cor.