MLA
Richter, F. Ad., and Co. Portrait of J.M. Poulson. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 61. https://digital.library.emory.edu/purl/11615dv446-cor.
APA, 6th edition
Richter, F. A., & C. Portrait of J.M. Poulson (Box 61) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/11615dv446-cor.
Chicago
Richter, F. Ad., and Co. “Portrait of J.M. Poulson.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 61. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/11615dv446-cor.