MLA
National Independent Political League, Washington, and D. C. Envelope for the National Negro American Political League. 1893. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 5. https://digital.library.emory.edu/purl/494vhhmj6r-cor.
APA, 6th edition
National Independent Political League, W., & D. C. (1893). Envelope for the National Negro American Political League (Box 1, Folder 5) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/494vhhmj6r-cor.
Chicago
National Independent Political League, Washington, and D.C. “Envelope for the National Negro American Political League.” Letters (correspondence). William H. Scott Family Papers, 1848-1982, 1893. Box 1, Folder 5. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/494vhhmj6r-cor.