MLA
Hugh C. Leighton Co. (Portland, Me.). Horseless age in the south. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/320sqv9s7d-cor.
APA, 6th edition
Hugh C. Leighton Co. (Portland, Me.). (unknown)[Horseless age in the south]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/320sqv9s7d-cor.
Chicago
Hugh C. Leighton Co. (Portland, Me.), Horseless age in the south, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/320sqv9s7d-cor.