For additional information about Meijer van Cleef and his family see the summary of the book Even now written by Saar Roelofs.
S. Roelofs, Nog altijd. Ronnie Goldstein-van Cleef over jeugd, verzet, concentratiekampen en het leven daarna (Kampen 2005)
In addition, a Jokos file (number 16317) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.