https://www.mappingthelives.org/bio/df7a97ee-cb24-43b5-a9bb-29bcf4085465
https://www.alemannia-judaica.de/rhina_synagoge.htm
Terezín Memorial (pamatnik-terezin.cz)
EHRI - Jäckel and Wetterhahn family papers (ehri-project.eu)
Jettchen Katz (1876–1943) • FamilySearch