1. United Nations . Single Convention on Narcotic Drugs , 1961 http://www.unodc.org/pdf/convention_1961_en.pdf
2. United Nations Convention on Psychotropic Substances , 1971 http://www.unodc.org/pdf/convention_1971_en.pdf
3. European Monitoring Centre for Drugs and Drug Addiction http://www.emcdda.europa.eu/topics/pods/controlling-new-psychoactive-substances
4. Laboratory and Scientific Section, United Nations Office on Drugs and Crime, Global Smart Programme The challenge of new psychoactive substances . http://www.unodc.org/documents/scientific/NPS_2013_SMART.pdf
5. Analytica Conference 2012 ‘Emerging Drugs of Abuse: From Chemistry to Medicine’ - Lecture Abstracts. Emerging drugs of abuse: What's on today?;Bovens;Toxichem. Krimtech.,2012