MLA
Poving, F. C. A Happy Family of Arkansas Citizens : Hot Springs National Park, Ark. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/866vx0k6gd-cor.
APA, 6th edition
Poving, F. C. A happy family of Arkansas citizens : Hot Springs National Park, Ark. (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/866vx0k6gd-cor.
Chicago
Poving, F. C. “A Happy Family of Arkansas Citizens : Hot Springs National Park, Ark.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/866vx0k6gd-cor.