https://www.mappingthelives.org/bio/e6d987c4-4f1a-426e-9025-ab7ee7280d30
https://www.alemannia-judaica.de/bad_vilbel_synagoge.htm
Bertha Lewi (Hahn) (Schönfeld) (1868 - 1942) - Genealogy (geni.com)
Gedenkbuch - Memorial book entry (bundesarchiv.de)