MLA
Lincoln Studio (Washington, D.C.). African American woman wearing a dress, sitting on a chair, with a book on her lap, with an African American man in a suit, sitting on the arm of the chair. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/040xpnvx25-cor.
APA, 6th edition
Lincoln Studio (Washington, D.C.). (unknown)[African American woman wearing a dress, sitting on a chair, with a book on her lap, with an African American man in a suit, sitting on the arm of the chair]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/040xpnvx25-cor.
Chicago
Lincoln Studio (Washington, D.C.), African American woman wearing a dress, sitting on a chair, with a book on her lap, with an African American man in a suit, sitting on the arm of the chair, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/040xpnvx25-cor.