1. Anoniem (2017). More US drug deaths in 2016 than ever before. VOA News, Science and Health, 6 juni.
2. Drug Classroom (2016). Fentanyl: what you need to know.
https://www.youtube.com/watch?v=gxhylP-SsRw
. Geraadpleegd op: 26 november 2017.
3. Gerald, M. C. (2013). The drug book. From arsenic to xanax, 250 milestones in the history of drugs. New York: Sterling.
4. Katz, J. (2017). The first count of fentanyl deaths in 2016: up 540 % in three years. New York Times, 2 september.
5. Koning, R., & Niesink, R. (2013). Nieuwe psychoactieve stoffen (NPS): niets nieuws onder de zon. Verslaving, 9(1), 47–59.