Bertha de Wilde was a daughter of Abraham de Wilde and Klaartje Roeg. She married in Amsterdam on 2 August 1939 to Jakob Fuldauer from Dinslaken, son of Robert Fuldauer and Jeanette Berlijn.
City Archive of Amsterdam, archive card of Jakob Fuldauer.
In addition, a Jokos file (number 293) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.