Pinkas HaNitzolim II (jewishgen.org)
Tonda Derfler (yadvashem.org)
Tunda Werner neé Dörfler https://collections.arolsen-archives.org/en/search/person/69664958?s=Derfler%20tunda&t=2744134&p=1
https://collections.arolsen-archives.org/en/search/person/78813657?s=Derfler%20tunda&t=19007&p=1