1. United Nations Office on Drugs and Crime (UNODC): World Drug Report, 2005, vol. 1: Analysis. UNODC, 2005.
2. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA): Annual Report, 2005. http://annualreport.emcdda.eu.int/en/home-en.html.
3. World Health Organisation (WHO): Biregional Strategy for Harm Reduction, 2005–2009. HIV and Injecting Drug Use. WHO, 2005.
4. National prevalence of problematic opiate use in Ireland;Comiskey;EMCDDA Tech. Report,1999
5. A. Kelly, M. Carvalho, C. Teljeur: Prevalence of Opiate Use in Ireland 2000–2001. A 3-Source Capture Recapture Study. A Report to the National Advisory Committee on Drugs, Sub-committee on Prevalence. Small Area Health Research Unit, Department of Public.