MLA
Four Men Looking at an Airplane Propeller's Engine. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2. https://digital.library.emory.edu/purl/044bnzs7pg-cor.
APA, 6th edition
Four men looking at an airplane propeller's engine (Box 2). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/044bnzs7pg-cor.
Chicago
“Four Men Looking at an Airplane Propeller's Engine.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/044bnzs7pg-cor.