MLA
Publisher., G. W. Morris. Postcard to Mr. Lawrence Atkins. 1901. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/047rn8pk3h-cor.
APA, 6th edition
Publisher., G. W. M. (1901). Postcard to Mr. Lawrence Atkins (Box 69) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pk3h-cor.
Chicago
Publisher., G. W. Morris. “Postcard to Mr. Lawrence Atkins.” Postcards. Robert Langmuir African American Photograph Collection, 1901. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pk3h-cor.