MLA
Cotton Pickers : a Line of African American Men and African American Women in a Cotton Field, One Man with a Basket of Cotton on His Shoulder, One Man with His Hand on a Basket of Cotton on the Ground and One Woman Also with Her Hand on a Basket. 1910. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/170msbcc57-cor.
APA, 6th edition
Cotton pickers : a line of African American men and African American women in a cotton field, one man with a basket of cotton on his shoulder, one man with his hand on a basket of cotton on the ground and one woman also with her hand on a basket (Box 68). (1910). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcc57-cor.
Chicago
“Cotton Pickers : a Line of African American Men and African American Women in a Cotton Field, One Man with a Basket of Cotton on His Shoulder, One Man with His Hand on a Basket of Cotton on the Ground and One Woman Also with Her Hand on a Basket.” Postcards. Robert Langmuir African American Photograph Collection, 1910. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcc57-cor.