MLA
Harper, Park B. African American Family, with Man Giving Woman a Plate of Food, in Philadelphia, Pa. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15. https://digital.library.emory.edu/purl/39995x69wn-cor.
APA, 6th edition
Harper, P. B. African American family, with man giving woman a plate of food, in Philadelphia, Pa. (Box 15) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/39995x69wn-cor.
Chicago
Harper, Park B. “African American Family, with Man Giving Woman a Plate of Food, in Philadelphia, Pa.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/39995x69wn-cor.