1. European Monitoring Centre for Drugs and Drug Addiction.European drug report (2018): Trends and developments. Publications Office of the European Union Luxembourg 2018.http://www.emcdda.europa.eu/publications/edr/trends-developments/2018_en. Accessed November 25 2020.
2. United Nations Office of Drugs and Crime.Global synthetic drugs assessment amphetamine‐type stimulants and new psychoactive substances Vienna 2017.https://www.unodc.org/documents/scientific/Global_Synthetic_Drugs_Assessment_2017.pdf. Accessed November 25 2020.
3. World Drug Report 2018 (United Nations publication Sales No. E.18.XI.9).https://www.unodc.org/wdr2018/prelaunch/WDR18_Booklet_1_EXSUM.pdf. Accessed November 25 2020.
4. European Monitoring Centre for Drugs and Drug Addiction 2017 High‐risk drug use and new psychoactive substances EMCDDA Rapid Communication Publications Office of the European Union Luxembourg.https://www.unodc.org/documents/scientific/Global_Drugs_Assessment_2017.pdf. Accessed November 25 2020.
5. New psychoactive substances: Purchasing and supply patterns in Australia