1. Appendix 1–8 Number of reported cases and crime rate for homicide and theft in each country (1991‐2010). The White Paper on Crime 2012. The Ministry of Justice.2012. [Accessed 14 Sept 2015]. Available from:http://hakusyo1.moj.go.jp/en/61/nfm/n_61_3_1_8_0_0.html.
2. Gun‐use criminal cases reported to police 2. Firearm Offenses VII. Drug and Firearm Control. CRIME IN JAPAN IN 2010. Police Policy Research Center National Police Academy. Alumni Association for National Police Academy.2010 18. [Accessed 14 Sept 2015]. Available from:https://www.npa.go.jp/english/seisaku/Crime_in_Japan_in_2010.pdf.
3. Murder Victims by Weapon 2009–2013 Crime in the United States 2013. The Federal Bureau of Investigation.2013. [Accessed 14 Sept 2015]. Available from:http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2013/crime-in-the-u.s.-2013/offenses-known-to-law-enforcement/expanded-homicide/expanded_homicide_data_table_8_murder_victims_by_weapon_2009-2013.xls.
4. The Metropolitan Police Department.Trends in crime in 2011.2012. [Accessed 14 Sept 2015]. Available from:https://www.npa.go.jp/toukei/seianki/h23hanzaizyousei.pdf.
5. Cabinet office Government of Japan.Suicide White Paper.2014. [Accessed 14 Sept 2015]. Available from:http://www8.cao.go.jp/jisatsutaisaku/whitepaper/w-2014/pdf/gaiyou/pdf/1-1.pdf.