MLA
O'Brien, C. J. The Pink House, A Williamsburg in Miniature. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/675r7sqvdt-cor.
APA, 6th edition
O'Brien, C. J. The Pink House, A Williamsburg in Miniature (Box 74) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/675r7sqvdt-cor.
Chicago
O'Brien, C. J. “The Pink House, A Williamsburg in Miniature.” Photographic 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/675r7sqvdt-cor.