MLA
Hugh C. Leighton Co., Manufacturers (Portland, Me.). Rockledge, Fla. : the Plaza Hotel. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/426m0cfxv2-cor.
APA, 6th edition
Hugh C. Leighton Co., Manufacturers (Portland, Me.). (unknown)[Rockledge, Fla. : the Plaza Hotel]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/426m0cfxv2-cor.
Chicago
Hugh C. Leighton Co., Manufacturers (Portland, Me.), Rockledge, Fla. : the Plaza Hotel, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/426m0cfxv2-cor.