Haus der Lehrers, Berlin-Alexanderplatz (House of Teachers, Berlin-Alexanderplatz), 1964, 1974, Box: 2, Folder: 55. Edith Krull collection, MS 345. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/375458 Accessed December 31, 2024.