1. Centers for Disease Control and Prevention (CDC), National Center for Injury Prevention and Control; 2009.http://www.cdc.gov/ncipc/dvp/suicide/suicide_data_sheet.pdf [accessed 2 February 2009].
2. National Association of State Mental Health Program Directors Research Institute (NRI); 2006. http://www.nri-inc.org/projects/Profiles/RevExp2008/T20.pdf [accessed 27 September 2010].
3. Suicide prevention by limiting access to methods: a review of theory and practice;Florentine;Social Science and Medicine,2010
4. Department of Health. National suicide prevention strategy for England. London; 2002.
5. Prevention of suicide and attempted suicide in Denmark;Nordentoft;Danish Medical Bulletin,2007