MLA
Mels, Edgar. A Century of Assassinations, Pearson's Magazine. 1848. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 43. https://digital.library.emory.edu/purl/385n8pk270-cor.
APA, 6th edition
Mels, E. (1848). A Century of Assassinations, Pearson's Magazine (Box 2, Folder 43) [Clippings (information artifacts)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk270-cor.
Chicago
Mels, Edgar. “A Century of Assassinations, Pearson's Magazine.” Clippings (information artifacts). William H. Scott Family Papers, 1848-1982, 1848. Box 2, Folder 43. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk270-cor.