MLA
Hirschwitz, A. Old Slave Block, New Orleans, La. 1955. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/757np5hqfg-cor.
APA, 6th edition
Hirschwitz, A. (1955). Old slave block, New Orleans, La. (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/757np5hqfg-cor.
Chicago
Hirschwitz, A. “Old Slave Block, New Orleans, La.” Postcards. Robert Langmuir African American Photograph Collection, 1955. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/757np5hqfg-cor.