MLA
A Study in Expression : Showing That All Coons Do Not Look Alike-in Southern Pines, N.C. : Six African American Children Sitting on the Steps in a Doorway. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/904dncjt0p-cor.
APA, 6th edition
A study in expression : showing that all coons do not look alike-in Southern Pines, N.C. : six African American children sitting on the steps in a doorway (Box 73). (1908). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/904dncjt0p-cor.
Chicago
“A Study in Expression : Showing That All Coons Do Not Look Alike-in Southern Pines, N.C. : Six African American Children Sitting on the Steps in a Doorway.” Postcards. Robert Langmuir African American Photograph Collection, 1908. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/904dncjt0p-cor.