https://www.joodsmonument.nl/nl/page/27448/hanna-duizend-de-jong
Hanna Duizend (de Jong) (1857 - 1944) - Genealogy (geni.com)
https://archief.amsterdam/indexen/deeds/985333f1-cf2e-56a3-e053-b784100ade19?person=985333f1-cf2f-56a3-e053-b784100ade19
https://www.maxvandam.info/humo-gen/family/1/F33166?main_person=I88198