MLA
Russell, George William, 1867-1935. Letter from George Russell (AE) (Dublin) to Augusta Gregory. Letter contains an illustration of William Butler Yeats standing on a soapbox - September 3, 1898. September 3, 1898. Gregory Family Papers, 1770-1956. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gbk0-cor.
APA, 6th edition
Russell, George William, 1867-1935. (September 3, 1898)[Letter from George Russell (AE) (Dublin) to Augusta Gregory. Letter contains an illustration of William Butler Yeats standing on a soapbox - September 3, 1898]. Gregory Family Papers, 1770-1956, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gbk0-cor.
Chicago
Russell, George William, 1867-1935, Letter from George Russell (AE) (Dublin) to Augusta Gregory. Letter contains an illustration of William Butler Yeats standing on a soapbox - September 3, 1898, September 3, 1898, Gregory Family Papers, 1770-1956, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gbk0-cor.