Directors Netherlands Institute for Space Research

^ johan bleeker (1942): pionier en koersbepaler van het ruimteonderzoek (in dutch). netherlands institute space research. retrieved 26 june 2016. 
^ algemeen directeur karel wakker verlaat sron (in dutch). netherlands institute space research. 30 january 2009. retrieved 26 june 2016. 
^ new directorate @ space research institute sron . netherlands institute space research. 21 june 2010. retrieved 26 june 2016.