MLA
McGabe. Two Little African American Girls in Matching Dresses, One Sitting and One Standing. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 61. https://digital.library.emory.edu/purl/9117m0cg1z-cor.
APA, 6th edition
M. G. Two little African American girls in matching dresses, one sitting and one standing (Box 61) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9117m0cg1z-cor.
Chicago
McGabe. “Two Little African American Girls in Matching Dresses, One Sitting and One Standing.” 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/9117m0cg1z-cor.