MLA
Valentine, and Sons. Orange Pickers at Work, Florida : African American Men on Ladders with Horse Drawn Cart. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/68605qftxq-cor.
APA, 6th edition
V., & S. (1908). Orange pickers at work, Florida : African American men on ladders with horse drawn cart (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/68605qftxq-cor.
Chicago
Valentine, and Sons. “Orange Pickers at Work, Florida : African American Men on Ladders with Horse Drawn Cart.” Postcards. Robert Langmuir African American Photograph Collection, 1908. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/68605qftxq-cor.