MLA
Two Men with a Horse and One Standing behind Them in a Wood Structure. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/624jm63xt0-cor.
APA, 6th edition
Two men with a horse and one standing behind them in a wood structure (Box 75). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/624jm63xt0-cor.
Chicago
“Two Men with a Horse and One Standing behind Them in a Wood Structure.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/624jm63xt0-cor.