MLA
Rosin, and Co. Picking but Not Cotton : Three African American Children and a Puppy on a Porch, with One Girl Checking Another's Head. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/730bvq83d8-cor.
APA, 6th edition
R., & C. Picking but not cotton : three African American children and a puppy on a porch, with one girl checking another's head (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/730bvq83d8-cor.
Chicago
Rosin, and Co. “Picking but Not Cotton : Three African American Children and a Puppy on a Porch, with One Girl Checking Another's Head.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/730bvq83d8-cor.