MLA
C. H. Gallup & Co. (Poughkeepsie, N.Y.). The chimney sweep : John King. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v6x0t-cor.
APA, 6th edition
C. H. Gallup & Co. (Poughkeepsie, N.Y.). (unknown)[The chimney sweep : John King]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v6x0t-cor.
Chicago
C. H. Gallup & Co. (Poughkeepsie, N.Y.), The chimney sweep : John King, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/84302v6x0t-cor.