Holocaust Survivors and Victims Database – Nathan Freund (ushmm.org)
https://collections.arolsen-archives.org/en/search/person/69842967?s=Freund%20Nathan&t=542885&p=0
https://collections.arolsen-archives.org/en/search/person/67083957?s=Freund%20Nathan&t=2737359&p=0
USC Shoah Foundation - Survivor Interviews (jewishgen.org)