MLA
Rotograph Co. (New York, N.Y.). Black diamond express : an African American boy riding in a cart being pulled by a goat. 190--01-17. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/699n2z34ww-cor.
APA, 6th edition
Rotograph Co. (New York, N.Y.). (190--01-17)[Black diamond express : an African American boy riding in a cart being pulled by a goat]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/699n2z34ww-cor.
Chicago
Rotograph Co. (New York, N.Y.), Black diamond express : an African American boy riding in a cart being pulled by a goat, 190--01-17, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/699n2z34ww-cor.