1. United Nations Office on Drugs and Crime, 2020 World Drug Report 2020. Vienna: United Nations. Available at: 〈https://wdr.unodc.org/wdr2020/field/WDR20_BOOKLET_4.pdf〉.
2. Drugs in Prison;Centre for Social Justice,2015
3. Spice: The Bird Killer - What Prisoners Think About the Use of Spice and Other Legal Highs in Prison,2016
4. Inhomogeneities in herbal mixtures: a serious risk for consumers;Moosmann;Forensic Toxicol.,2015
5. Psychoactive Substances Act. Elizabeth ll. Chapter 2. 2016, London: The Stationery Office.