Sara Bak had been the widow of Abraham Bak since 3 April 1940. She lived at 139 Willem de Zwijgerlaan in Amsterdam.
Amsterdam municipal archive, Records Jokos, Möbel-claim 18810; property Joods Maatschappelijk Werk
Sara Bak-van Buren took her own life under pressure of the circumstances.
NIOD, Records Joodse Raad, box 244d, letter d.d. 7 August 1942
In addition, a Jokos file (number 18810) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.