Duifje Elsas was a daughter of Emanuel Elsas and Keetje Hagenaar. She married 15 December in Amsterdam to Barend Roodveldt, son of Hartog Roodveldt and Jette Appelboom.
City Archive of Amsterdam, archive card of Emanuel Elsas and website www.wiewaswie.nl .
In addition, a Jokos file (number 9299) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.