RT Article T1 Evaluating the effectiveness of school-bullying prevention programs: An updated meta-analytical review JF Aggression and violent behavior A1 Gaffney, Hannah A2 Farrington, David 1944- A2 Ttofi, Maria M. LA English YR 2018 UL https://krimdok.uni-tuebingen.de/Record/1912541998 DO 10.1016/j.avb.2018.07.001