MLA
Hugh C. Leighton Co., Manufacturers (Portland, Me.). The Devils Mill Hopper, near Gainesville, Fla. [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98skf-cor.
APA, 6th edition
Hugh C. Leighton Co., Manufacturers (Portland, Me.). (unknown)[The Devils Mill Hopper, near Gainesville, Fla. [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98skf-cor.
Chicago
Hugh C. Leighton Co., Manufacturers (Portland, Me.), The Devils Mill Hopper, near Gainesville, Fla. [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98skf-cor.