MLA
Six Men, Three with Rifles, Standing at a Camp Site with Tables and a Tent in the Background. 1907. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 29. https://digital.library.emory.edu/purl/986b2rbp46-cor.
APA, 6th edition
Six men, three with rifles, standing at a camp site with tables and a tent in the background (Box 29). (1907). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbp46-cor.
Chicago
“Six Men, Three with Rifles, Standing at a Camp Site with Tables and a Tent in the Background.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1907. Box 29. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbp46-cor.