MLA
Gonne, Maud, 1866-1953. Draft [?] letter written by Maud Gonne to William Butler Yeats - October 1, 1927. October 1, 1927. Maud Gonne and W.B. Yeats Papers, circa 1890-1938. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/907tmpg6rm-cor.
APA, 6th edition
Gonne, Maud, 1866-1953. (October 1, 1927)[Draft [?] letter written by Maud Gonne to William Butler Yeats - October 1, 1927]. Maud Gonne and W.B. Yeats Papers, circa 1890-1938, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/907tmpg6rm-cor.
Chicago
Gonne, Maud, 1866-1953, Draft [?] letter written by Maud Gonne to William Butler Yeats - October 1, 1927, October 1, 1927, Maud Gonne and W.B. Yeats Papers, circa 1890-1938, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/907tmpg6rm-cor.