Marianna Leefsma was a daughter of Meijer Leefsma.
Stadsarchief Amsterdam, archiefkaart Meijer Leefsma
On 4 April 1943 Marianna de Lange-Leefsma wrote a typed letter in Westerbork. This letter remains.
Jewish Historical Museum, Documents collection, inv.nr 7194
In addition, Jokos files (numbers 60147, 2056) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.