MLA
Children Sitting on a Horse. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5. https://digital.library.emory.edu/purl/989r2280n7-cor.
APA, 6th edition
Children sitting on a horse (Box 5). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280n7-cor.
Chicago
“Children Sitting on a Horse.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 5. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280n7-cor.