MLA
Rev. Carroll Holding a Horse by the Reigns, with Another Man in a Suit and Hat Standing behind Them. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/037hqbzkjt-cor.
APA, 6th edition
Rev. Carroll holding a horse by the reigns, with another man in a suit and hat standing behind them (Box 74). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzkjt-cor.
Chicago
“Rev. Carroll Holding a Horse by the Reigns, with Another Man in a Suit and Hat Standing behind Them.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzkjt-cor.