Heine 1994. Werner Heine & Annette Haxton (1994), "'Futura' without a Future: Kurt Schwitters' Typography for Hanover Town Council, 1929-1934", Journal of Design History, 7 (2): 127–140, doi:10.1093/jdh/7.2.127, JSTOR1316081
"Hannover City 2020 +". Hannover.de (in German). Presse- und Öffentlichkeitsarbeit der Landeshauptstadt Hannover. Retrieved 30 November 2015.
jstor.org
Heine 1994. Werner Heine & Annette Haxton (1994), "'Futura' without a Future: Kurt Schwitters' Typography for Hanover Town Council, 1929-1934", Journal of Design History, 7 (2): 127–140, doi:10.1093/jdh/7.2.127, JSTOR1316081