MLA
Blake, ... A. African American boy standing with one hand on an open book, and the other raised, while wearing a suit. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d7zw-cor.
APA, 6th edition
Blake, ... A. (unknown)[African American boy standing with one hand on an open book, and the other raised, while wearing a suit]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d7zw-cor.
Chicago
Blake, ... A, African American boy standing with one hand on an open book, and the other raised, while wearing a suit, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d7zw-cor.