MLA
Gonne, Maud, 1866-1953. Letter written by Maud Gonne to William Butler Yeats - October 29 [September 1910]. September 1910. 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/747dr7st2b-cor.
APA, 6th edition
Gonne, Maud, 1866-1953. (September 1910)[Letter written by Maud Gonne to William Butler Yeats - October 29 [September 1910]]. 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/747dr7st2b-cor.
Chicago
Gonne, Maud, 1866-1953, Letter written by Maud Gonne to William Butler Yeats - October 29 [September 1910], September 1910, 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/747dr7st2b-cor.