MLA
Gonne, Maud, 1866-1953. Letter written by Maud Gonne to William Butler Yeats - December 25 [1897]. December 25, 1897. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/767wm37s0k-cor.
APA, 6th edition
Gonne, Maud, 1866-1953. (December 25, 1897)[Letter written by Maud Gonne to William Butler Yeats - December 25 [1897]]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/767wm37s0k-cor.
Chicago
Gonne, Maud, 1866-1953, Letter written by Maud Gonne to William Butler Yeats - December 25 [1897], December 25, 1897, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/767wm37s0k-cor.