MLA
Sinclair, W. A. Constitutional League of the United States, Appeal to the Republican Party in National Convention Assembled to Repudiate and Eliminate the Color Line Drawn in the Party, Card, No Date. 1906. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 49. https://digital.library.emory.edu/purl/6386hdr98t-cor.
APA, 6th edition
Sinclair, W. A. (1906). Constitutional League of the United States, appeal to the Republican Party in National Convention assembled to repudiate and eliminate the color line drawn in the party, card, no date (Box 2, Folder 49) [Fliers]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr98t-cor.
Chicago
Sinclair, W. A. “Constitutional League of the United States, Appeal to the Republican Party in National Convention Assembled to Repudiate and Eliminate the Color Line Drawn in the Party, Card, No Date.” Fliers. William H. Scott Family Papers, 1848-1982, 1906. Box 2, Folder 49. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr98t-cor.