Research on mental retardation in the Netherlands : contributions to the 9th World Congress IASSMD, August 1992, Australia / ed. by M.I.M. Schuurman, D.A. Flikweert
"Research on mental retardation in the Netherlands : contributions to the 9th World Congress IASSMD, August 1992, Australia / ed. by M.I.M. Schuurman, D.A. Flikweert"