-
Quellen zu deutschen Himalayaexpeditionen (1929–1989) im Archiv des Deutschen Alpenvereins (DAV), München ; Sources on German Himalayan Expeditions (1929 — 1989) in the Archiv des Deutschen Alpenvereins (DAV), Munich
perspectivia.net - The publication platform of the Max Weber Foundation, 2021
BASE - Bielefeld Academic Search Engine , perspectivia.net - The publication platform of the Max Weber Foundation