MLA
Hugh C. Leighton Co., Manufacturers (Portland, Me.). Camden, Me. : Negro Island light. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zft-cor.
APA, 6th edition
Hugh C. Leighton Co., Manufacturers (Portland, Me.). (unknown)[Camden, Me. : Negro Island light]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zft-cor.
Chicago
Hugh C. Leighton Co., Manufacturers (Portland, Me.), Camden, Me. : Negro Island light, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zft-cor.