MLA
M. Mark (Jacksonville, Fla.). Grapefruit tree in Florida : African American man in front of a grapefruit tree holding two [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wpw-cor.
APA, 6th edition
M. Mark (Jacksonville, Fla.). (unknown)[Grapefruit tree in Florida : African American man in front of a grapefruit tree holding two [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wpw-cor.
Chicago
M. Mark (Jacksonville, Fla.), Grapefruit tree in Florida : African American man in front of a grapefruit tree holding two [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wpw-cor.