In addition, a Jokos file (number 16000) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a bookshop, address: Herengracht 234 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives