Elisabeth Cosman was a daughter of Hartog Cosman and Eva Kleerekoper. She married in Amsterdam on 22 June 1933 to Abraham Root, son of Juda Root and Schoontje Brilleman.
City Archive of Amsterdam, archive card of Abraham Root and Elisabeth Cosman.
In addition, a Jokos file (number 55238) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.