MLA
Gwine Back to Dixie : an African American Man, Woman, and Two Boys, along with a Donkey, Walking with Their Backs to the Camera [Hand Colored]. 1913. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/105s7h44ks-cor.
APA, 6th edition
Gwine back to Dixie : an African American man, woman, and two boys, along with a donkey, walking with their backs to the camera [hand colored] (Box 72). (1913). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/105s7h44ks-cor.
Chicago
“Gwine Back to Dixie : an African American Man, Woman, and Two Boys, along with a Donkey, Walking with Their Backs to the Camera [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1913. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/105s7h44ks-cor.