"If I Were Four-and-Twenty" in preparation, 1 p, September 7, 1940, Folder: Eb.2, item: 2d, item: 2d.13. Yeats family correspondence, MS 25. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/265001 Accessed May 27, 2024.