MLA
St. Louis Souvenir Card Co. Ragged, but Happy : African American Man Eating a Watermelon and an Old African American Man. 1903. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/610wpzgmvx-cor.
APA, 6th edition
St. Louis Souvenir Card Co. (1903). Ragged, but happy : African American man eating a watermelon and an old African American man (Box 73) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/610wpzgmvx-cor.
Chicago
Louis Souvenir Card Co., St. “Ragged, but Happy : African American Man Eating a Watermelon and an Old African American Man.” Postcards. Robert Langmuir African American Photograph Collection, 1903. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/610wpzgmvx-cor.