In September 1940, five obituaries were placed in het Nieuw Israëlietisch Weekblad for Hartog Frank. A short obituary appeared in the same edition.
//Nieuw Israëlietisch Weekblad, 13 September 1940;
Nieuw Israëlietisch Weekblad, 20 September 1940//
In addition, a Jokos file (number 17462) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.