MLA
Pogue, P. C. Bullets Thick, Letter to the Editor by P. C. Pogue, 1900. 1900. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 10. https://digital.library.emory.edu/purl/416c2fr0n9-cor.
APA, 6th edition
Pogue, P. C. (1900). Bullets Thick, Letter to the Editor by P. C. Pogue, 1900 (Box 1, Folder 10) [Clippings (information artifacts)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fr0n9-cor.
Chicago
Pogue, P. C. “Bullets Thick, Letter to the Editor by P. C. Pogue, 1900.” Clippings (information artifacts). William H. Scott Family Papers, 1848-1982, 1900. Box 1, Folder 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fr0n9-cor.