Geert Mak

tek Wayback Machine. The Independent. London, UK – via hanskoning.net. Mak, Geert (April 20, 2007). "Hans Koning (1921-2007): Mieters socialist". De Groene

|language= (Ndihmë!) ^ Dekkers, Hetty P.J.M.; Bosker, Roel J.; Driessen, Geert W.J.M. (mars 2000). "Complex Inequalities of Educational Opportunities.