TY - JOUR TI - Four decades of research on school bullying: An introduction. JF - American Psychologist AU - Hymel, Shelley AU - Swearer, Susan M. UR - http://search.ebscohost.com/login.aspx?direct=true&db=pdh&AN=2015-20405-001&site=ehost-live PY - 2015 EP - 299 SP - 293 IS - 4 VL - 70 ER -