https://www.sjoa-drenthe.nl/humogen/family.php?database=humo3_&id=F15988&main_person=I40794
https://www.maxvandam.info/humo-gen/family/1/F61101?main_person=I161614
https://www.joodsmonument.nl/en/page/469830/child-of-hartog-bamberger-and-his-family
Betsy Bamberger (deceased) - Genealogy (geni.com)