Letter : 4 Broad Street, Oxford to Percy Simpson
MLA
Yeats, W. B. (William Butler), 1865-1939. Letter : 4 Broad Street, Oxford to Percy Simpson. Box 10 | Folder 10. 1921 October 15[?]. https://collections.library.yale.edu/catalog/2036972.
APA, 6th edition
Yeats, W. B. (William Butler), 1865-1939. (["Box 10 | Folder 10"])(1921 October 15[?])[Letter : 4 Broad Street, Oxford to Percy Simpson]. https://collections.library.yale.edu/catalog/2036972.