MLA
tribune., National. Man Standing next to a Cannon in Front of John Brown's Fort, Where John Brown Held out during His Raid on Harpers Ferry. 1909. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/791sf7m0h1-cor.
APA, 6th edition
tribune., N. (1909). Man standing next to a cannon in front of John Brown's Fort, where John Brown held out during his raid on Harpers Ferry (Box 69) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m0h1-cor.
Chicago
tribune., National. “Man Standing next to a Cannon in Front of John Brown's Fort, Where John Brown Held out during His Raid on Harpers Ferry.” Postcards. Robert Langmuir African American Photograph Collection, 1909. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m0h1-cor.