1. Studies in Crime: An Introduction to Forensic Archaeology;Hunter,2002
2. Crime in the United States – 2003 – Uniform Crime Reports,2003
3. Home Office Website—Crime Statistics in England and Wales, http://www.crimestatistics.org.uk/output/page40.asp.
4. Murder By Numbers: British Serial Sex Killers Since 1950: Their Childhoods, Their Lives, Their Crimes;Gekoski,1998
5. The Corpse Garden: The Crime of Fred and Rose West;Wilson,1998