MLA
Homer, Winslow, 1836-1910. The turtle pond : an African American man in a boat and another in the water catching a sea turtle. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhhqw-cor.
APA, 6th edition
Homer, Winslow, 1836-1910. (unknown)[The turtle pond : an African American man in a boat and another in the water catching a sea turtle]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhhqw-cor.
Chicago
Homer, Winslow, 1836-1910, The turtle pond : an African American man in a boat and another in the water catching a sea turtle, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhhqw-cor.