MLA
Valentine, and Sons. On the Golf Course in Thomasville, Ga. : Male Golfers and Caddies at the 7th Hole. 1909. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/047rn8pk2r-cor.
APA, 6th edition
V., & S. (1909). On the golf course in Thomasville, Ga. : male golfers and caddies at the 7th hole (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pk2r-cor.
Chicago
Valentine, and Sons. “On the Golf Course in Thomasville, Ga. : Male Golfers and Caddies at the 7th Hole.” Postcards. Robert Langmuir African American Photograph Collection, 1909. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pk2r-cor.