In August 1941, an obituary was placed in Het Joodsche Weekblad for Rosa Hertz-Marx.
Het Joodsche Weekblad, 15 August 1941, 11
The funeral records at the Jewish cemetery in Arnhem reveal that a memorial stone is placed for Therese Marx.
Zie: Huwelijk Lazarus Hertz & Meijer Hertz & Helene Michels & Therese Marx & Jakob Alexander Marx & Rebecca Simon op 14 februari 1905 te Arnhem » Open Archieven