1. Fentanyl-associated fatalities among illicit drug users in Wayne County, Michigan (July 2005–May 2006);Algren;Journal of Medical Toxicology,2013
2. Associated Press, AP. (2017). Illicit-drug use ok in ‘safe’ site under Maryland bill. Last Modified February 17 2017 http://baltimore.cbslocal.com/2017/02/17/illicit-drug-use-ok-in-safe-site-under-maryland-bill/.
3. Injecting fentanyl — Minimising the risks;Australian Injecting & Illicit Drug Users League, AIVL,2013
4. The bogus drug: Three methyl & alpha methyl fentanyl sold as China White;Ayres;Journal of Psychoactive Drugs,1981
5. Nonpharmaceutical fentanyl-related deaths — Multiple states, April 2005–March 2007;Centers for Disease Control and Prevention, US;Morbidity and Mortality Weekly Report,2008