MLA
Jack Johnson : an African American Boxer. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/262s4mw6ps-cor.
APA, 6th edition
Jack Johnson : an African American boxer (Box 74). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6ps-cor.
Chicago
“Jack Johnson : an African American Boxer.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6ps-cor.