1. Olweus D (1991) Bully/victim problems among school children: basic facts and effects of a school based intervention program. In: Pepler DJ, Rubin KH (eds) The development and treatment of childhood aggression. Lawrence Erlbaum, Hillsdale, pp 411–448
2. Olweus D (1993) Bullying at school: what we know and what we can do. Blackwell, Oxford
3. Leymann H (1993) Mobbing: Psychoterror am Arbeitsplatz und wie man sich dagegen wehren kann. [Mobbing: Terrorization at work—and how to ward it off]. Rowohlt, Reinbek
4. Olweus D (1992) Bullying among schoolchildren: intervention and prevention. In: Peters RD, McMahon RJ, Quinsley VD (eds) Aggression and violence throughout the lifespan. Sage, Newbury Park, pp 100–125
5. Smith PK, Madsen KC, Moody JC (1999) What causes the age decline in reports of being bullied at school? Toward a developmental analysis of risks of being bullied. Educ Res 41:267–285