Margaretha Monnikendam was a daughter of Isidore Monnikendam and Elisabeth Ziekenoppasser. She married 20 May 1931 in Amsterdam to Lucas Vreeland, a son of Levie Vreeland and Sara Blitz.
City Archive of Amsterdam, archive card of Isidore Monnikendam and website www.wiewaswie .
In addition, a Jokos file (number 7281) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.