van Aken, Marcel A. G. MPI for Psychological Research (Munich, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
van Aken, M. A. G. (1994). The transactional relation between social support and children's competence. In F. Nestmann, & K. Hurrelmann (Eds.), Social networks and social support in childhood and adolescence (pp. 131-148). Berlin: de Gruyter.