Bron:Yad Vashem, Documentation gathered by Hermann Weisz in the Theresienstadt Ghetto: Album No. 5 - Transportleitung, Abt. für Innere Verwaltung (Transport Management, Internal Administration Department), 1941-1944.
In addition, a Jokos file (number 385) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.