RT Article T1 Development during middle childhood: the years from 6 to 12, by W. A. Colins JF Contemporary psychology VO 31 IS 12 SP 936 OP 938 A1 Hagen, J. W. LA English YR 1986 UL https://krimdok.uni-tuebingen.de/Record/162704258X K1 Kindesentwicklung