RT Article T1 Childhood aggression and withdrawal as predictors of adolescent pregnancy, early parenthood, and environmental risk for the next generation JF Canadian journal of behavioural science VO 23 IS 3 SP 318 OP 331 A2 Schwartzman, A. E. A2 Peters, P. L. A2 Mcaffer, V. J. LA English YR 1991 UL https://krimdok.uni-tuebingen.de/Record/1640165061 K1 Jugendliche K1 Schwangerschaft