MLA
Two Children by Santa Claus with Drawing of Reindeer on Back. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 13. https://digital.library.emory.edu/purl/160cvdncqq-cor.
APA, 6th edition
Two children by Santa Claus with drawing of reindeer on back (Box 13). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/160cvdncqq-cor.
Chicago
“Two Children by Santa Claus with Drawing of Reindeer on Back.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 13. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/160cvdncqq-cor.