MLA
African American Young Man Sitting on a Chair with His Legs Crossed, While Holding a Book Titled The Time Is at Hands under His Arm, While Wearing a Suit and Hat. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/320sqv9s73-cor.
APA, 6th edition
African American young man sitting on a chair with his legs crossed, while holding a book titled The time is at hands under his arm, while wearing a suit and hat (Box 74). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/320sqv9s73-cor.
Chicago
“African American Young Man Sitting on a Chair with His Legs Crossed, While Holding a Book Titled The Time Is at Hands under His Arm, While Wearing a Suit and Hat.” 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/320sqv9s73-cor.