Voor meer informatie over Leo Calff en zijn echtgenote Martha Stoppelman, zijn broer Herman Calff en diens echtgenote Rika Stoppelman, zie het boek van Marijke Barend-van Haeften en Frits Barend: Matzes en mie: De lotgevallen van de families Barend en Van Haeften (Amsterdam 2017) 135-138.
In addition, a Jokos file (number 9752) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
In David Cohen's (Co-Chairman of the Joodse Raad) recollections of the occupation he mentions the case of a member of the Raad's Financial Committee named Calff who was detained in a SiPo razzia on August 9 along with his two sons and one daughter. According to Cohen's account, this gentleman was id…