1. Edward Jenner and the Eradication of Smallpox
2. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders (DSM-5). 5th ed. American Psychiatric Publishing; 2010.
3. Substance Abuse and Mental Health Services Administration. Key substance use and mental health indicators in the United States: results from the 2020 National Survey on Drug Use and Health (HHS Publication No. PEP21-07-01-003, NSDUH Series H-56). Rockville, MD: Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration; 2021. Accessed from: https://www.samhsa.gov/data/. Accessed September 23, 2022.
4. World Drug Report. United Nations publication, Sales No; 2021.
5. Changes in heroin self-administration by a rhesus monkey after morphine immunisation