MLA
Co., E. C. Kropp. Hardey Montgomery, Born 1799, One Hundred and Sixteen Years Old. 1915. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/180vq83bmp-cor.
APA, 6th edition
Co., E. C. K. (1915). Hardey Montgomery, born 1799, one hundred and sixteen years old (Box 72) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/180vq83bmp-cor.
Chicago
Co., E. C. Kropp. “Hardey Montgomery, Born 1799, One Hundred and Sixteen Years Old.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1915. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/180vq83bmp-cor.