MLA
Jimmy Carter and Hubert Humphrey - Hubert Humphrey and Two Other Men Look at a Cigar Box. 1950. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 2. https://digital.library.emory.edu/purl/197xksn0qg-cor.
APA, 6th edition
Jimmy Carter and Hubert Humphrey - Hubert Humphrey and two other men look at a cigar box (Box 6, Folder 2). (1950). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0qg-cor.
Chicago
“Jimmy Carter and Hubert Humphrey - Hubert Humphrey and Two Other Men Look at a Cigar Box.” Black-and-white photographs. Emory University Office of Alumni Publications Photographs, 1950. Box 6, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0qg-cor.