Keetje Witteboon was married in Amsterdam on 1 April 1942 to Meier Polak. City Archive of Amsterdam, archive card of Gerrit Witteboon and an addition of a visitor of the website.
In addition, a Jokos file (number 18711) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.