RT Article T1 Family therapy versus parent groups: effects on adolescent drug abusers JF The American journal of family therapy VO 17 IS 4 SP 335 OP 347 A1 Friedman, A. S. LA English YR 1989 UL https://krimdok.uni-tuebingen.de/Record/1637985479 K1 Familientherapie K1 Drogenabhängigkeit K1 Heranwachsende K1 Elternarbeit