MLA
A Row of People Standing in a Field next to Their Mule-Drawn Equipment. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2. https://digital.library.emory.edu/purl/972p5hqc4m-cor.
APA, 6th edition
A row of people standing in a field next to their mule-drawn equipment (Box 2). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqc4m-cor.
Chicago
“A Row of People Standing in a Field next to Their Mule-Drawn Equipment.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqc4m-cor.