MLA
Lyon, Fred ... (Canada). Portrait of an African American man in suit. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/105s7h44tq-cor.
APA, 6th edition
Lyon, Fred ... (Canada). (unknown)[Portrait of an African American man in suit]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/105s7h44tq-cor.
Chicago
Lyon, Fred ... (Canada), Portrait of an African American man in suit, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/105s7h44tq-cor.