1. Council Decision 2005/387/JHA of 20 May 2005 on the information exchange, risk-assessment and control of new psychoactive substances 2005
2. United Nations Office on Drugs and Crime (UNODC) The challenge of new psychoactive substances. A Report from the Global SMART Programme 2013
3. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) Online sales of new psychoactive substances / 'legal high': summary of results from the 2011 multilingual snapshot. Lisbon 2011 http://www.emcdda.europe.eu/attachements.cfm/att_143801_EN_SnapshotSummary.pdf
4. EMCDDA Action on new drugs http://www.emcdda.europa.eu/activities/action-on-new-drugs
5. European Commission New psychoactive substances projects, studies and research funded by the European Commission 2014 http://www.ec.europa.eu/justice/anti-_drugs/files/nps_report_2014_en.pdf