Jonas Fride married in Amsterdam on 5 February 1942 to Bertha Zeehandelaar, daughter of Salomon Zeehandelaar and Abigael de Cunha. City Archive of Amsterdam, archive card of Jacob Fride.
In addition, Jokos files (numbers 52268, 50229, 54285) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.