MLA
Graham, J. Scott. Another Brockway in the Progressive Fleet : Brockway Motor Truck Corp. : 27th above Lombard St. Progressive Coal Co. 1924. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/310jsxksrk-cor.
APA, 6th edition
Graham, J. S. (1924). Another Brockway in the progressive fleet : Brockway Motor Truck Corp. : 27th above Lombard St. Progressive Coal Co. (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxksrk-cor.
Chicago
Graham, J. Scott. “Another Brockway in the Progressive Fleet : Brockway Motor Truck Corp. : 27th above Lombard St. Progressive Coal Co.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1924. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxksrk-cor.