https://www.mappingthelives.org/bio/adaf072c-1cf8-4506-91e9-e907b0d2cc1f
https://spurenimvest.de/2023/02/06/sondheimer-johanna/
https://www.alemannia-judaica.de/kirchhain_synagoge.htm
Johanna Hannchen Hanchen Sondheimer (Kadden) (1885 - 1942) - Genealogy (geni.com)