1. European Monitoring Centre for Drugs and Drug Addiction. United Kingdom country overview. 2016. http://www.emcdda.europa.eu/countries/united-kingdom#prevalence. Last accessed March 17, 2017
2. European Monitoring Centre for Drugs and Drug Addiction. European drug report 2016: trends and developments. Luxembourg: European Monitoring Centre for Drugs and Drug Addiction; 2016
3. European Monitoring Centre for Drugs and Drug Addiction. The state of the drugs problem in Europe. Annual report 2011. Luxembourg: European Monitoring Centre for Drugs and Drug Addiction; 2011