Opera is My Hobby - The Metropolitan's First "Madama Butterfly"; In Memoriam: Ezio Flagello, basso; Five Great Sopranos at the Chicago Opera, Box: 13, Folder: 15. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163735 Accessed May 16, 2024.