Miniatures for Piano Four-Hands: Miscellaneous Numbers: "Humoresque" and "Impromptu", after 1918, Box: 3, Folder: 7. Leopold Godowsky score collection, MP-0016-01. The New School Archives. https://findingaids.archives.newschool.edu/repositories/3/archival_objects/57380 Accessed April 03, 2026.