1. Citations United Nations Office on Drugs and Crime, World Drug Report 2016 (United Nations publication, Sales No. E.16.XI.7)
2. European Monitoring Centre for Drugs and Drug Addiction European Drug Report 2016: Trends and Developments; Publications Office of the European Union: Luxembourg, 2016
3. Center for Behavioral Health Statistics and Quality Behavioral Health Trends in the United States: Results from the 2014 National Survey on Drug Use and Health 2015. (HHS Publication No. SMA 15-4927, NSDUH Series H-50) Retrieved from http://www.samhsa.gov/data/
4. National Institute on Drug Abuse. Cocaine 2016
5. Vaccines targeting drugs of abuse: is the glass half-empty or half-full?