https://collecties.kampwesterbork.nl/persoon/https%3A%2F%2Fkampwesterbork.nl%2Fdata%2Fperson%2F14246426
https://www.joodsmonument.nl/nl/page/213038/theodor-tobias
https://archief.amsterdam/indexen/deeds/98533402-d658-56a3-e053-b784100ade19?person=98533402-d659-56a3-e053-b784100ade19
http://www.betzdorf-geschichte.de/gedenkbuch1.htm
https://www.mappingthelives.org/bio/7855097b-c3f7-428e-b8c8-a52516cac96c