1. Vital signs: changes in opioid prescribing in the United States, 2006–2015;Guy;Morbidity and Mortality Weekly Report,2017
2. Hedegaard, H., Miniño, A. M., & Warner, M. (2020). Drug overdose deaths in the United States, 1999–2018. NCHS Data Brief, no 356. Hyattsville, MD: National Center for Health Statistics.
3. Recent increases in cocaine-related overdose deaths and the role of opioids;Jones;American Journal of Public Health,2017
4. Drug overdose deaths involving cocaine and psychostimulants with abuse potential — United States, 2003–2017;Kariisa;Morbidity and Mortality Weekly Report,2019
5. National Institutes of Health. (2019). Overdose Death Rates. National Institute on Drug Abuse (NIDA). https://www.drugabuse.gov/related-topics/trends-statistics/overdose-death-rates. Accessed October 10, 2019.