Elisabeth Koekoek was a daughter of Abraham Koekoek and Anna van de Star. She married in Amsterdam on 17 August 1932 to Levie Polak.
City Archive of Amsterdam, archive cards of Abraham Koekoek and Elisabeth Koekoek.
In addition, a Jokos file (number 17953) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.