MLA
A.L. Macbeth Studio (Baltimore, Md.). Man and a woman sitting in chairs, and men standing behind them. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/030prr4xnd-cor.
APA, 6th edition
A.L. Macbeth Studio (Baltimore, Md.). (unknown)[Man and a woman sitting in chairs, and men standing behind them]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/030prr4xnd-cor.
Chicago
A.L. Macbeth Studio (Baltimore, Md.), Man and a woman sitting in chairs, and men standing behind them, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/030prr4xnd-cor.