MLA
Gonne, Maud, 1866-1953. Letter written by Maud Gonne to William Butler Yeats - [June/July 1911]. between 1911-06 and 1911-07. 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/856n02v95j-cor.
APA, 6th edition
Gonne, Maud, 1866-1953. (between 1911-06 and 1911-07)[Letter written by Maud Gonne to William Butler Yeats - [June/July 1911]]. 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/856n02v95j-cor.
Chicago
Gonne, Maud, 1866-1953, Letter written by Maud Gonne to William Butler Yeats - [June/July 1911], between 1911-06 and 1911-07, 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/856n02v95j-cor.