MLA
Ahrens, Henry H. Old Liverpool, 108 Year Old Former Slave Who Died in 1938, Darien, Ga. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/5977sqv9w6-cor.
APA, 6th edition
Ahrens, H. H. Old Liverpool, 108 year old former slave who died in 1938, Darien, Ga. (Box 74) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5977sqv9w6-cor.
Chicago
Ahrens, Henry H. “Old Liverpool, 108 Year Old Former Slave Who Died in 1938, Darien, Ga.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5977sqv9w6-cor.