RT Article T1 Prosocial development in middle childhood: a longitudinal study JF Developmental psychology VO 23 IS 5 SP 712 OP 718 A2 Eisenberg, Nancy 1950- LA English YR 1987 UL https://krimdok.uni-tuebingen.de/Record/1627042571 K1 Prosoziales Verhalten K1 Kindesentwicklung