MLA
De Youngs' (N.Y.). Portrait of a bald African American man. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/484mkkwh9f-cor.
APA, 6th edition
De Youngs' (N.Y.). (unknown)[Portrait of a bald African American man]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/484mkkwh9f-cor.
Chicago
De Youngs' (N.Y.), Portrait of a bald African American man, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/484mkkwh9f-cor.