1. Mass, serial and sensational homicides;Dietz;Bulletin of the New York Academy of Medicine,1986
2. Crime Classification Manual – A Standard System for Investigating and Classifying Violent Crimes;Douglas,1997
3. Mass, serial and sensational homicides: the investigative perspective;Geberth;Bulletin of the New York Academy of Medicine,1986
4. Offender and offense characteristics of a nonrandom sample of mass murderers;Hempel;Journal of the American Academy of Psychiatry and Law,1999
5. Understanding mass murder: a starting point;Holmes;Federal Probation,1992