MLA
Photochrom., C. T. Sweet Contentment at the Old Cabin Door in Dixie Land : with Three African American Children Sitting on the Steps. 1916. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/706g1jwswn-cor.
APA, 6th edition
Photochrom., C. T. (1916). Sweet contentment at the old cabin door in Dixie Land : with three African American children sitting on the steps (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwswn-cor.
Chicago
Photochrom., C. T. “Sweet Contentment at the Old Cabin Door in Dixie Land : with Three African American Children Sitting on the Steps.” Postcards. Robert Langmuir African American Photograph Collection, 1916. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwswn-cor.