MLA
Bouer (Slater, Mo.). An African American man holding his hat, and a woman in a dress, holding a handkerchief. 1891. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/269m37pvqb-cor.
APA, 6th edition
Bouer (Slater, Mo.). (1891)[An African American man holding his hat, and a woman in a dress, holding a handkerchief]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/269m37pvqb-cor.
Chicago
Bouer (Slater, Mo.), An African American man holding his hat, and a woman in a dress, holding a handkerchief, 1891, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/269m37pvqb-cor.