MLA
Knight. A Tobacco Field in Kentucky : Two African American Men Harvesting Tobacco in a Field, in Kentucky [Hand Colored]. 1909. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/484mkkwhb2-cor.
APA, 6th edition
K. (1909). A tobacco field in Kentucky : two African American men harvesting tobacco in a field, in Kentucky [hand colored] (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/484mkkwhb2-cor.
Chicago
Knight. “A Tobacco Field in Kentucky : Two African American Men Harvesting Tobacco in a Field, in Kentucky [Hand Colored].” Photographic postcards. Robert Langmuir African American Photograph Collection, 1909. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/484mkkwhb2-cor.