MLA
Styron, O. M., and Co. The Biltmore Hotel : Durham, N.C. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/385n8pk0qv-cor.
APA, 6th edition
Styron, O. M., & C. The Biltmore Hotel : Durham, N.C. (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0qv-cor.
Chicago
Styron, O.M., and Co. “The Biltmore Hotel : Durham, N.C.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0qv-cor.