1. UNODC World Drug Report http://www.unodc.org/unodc/secured/wdr/wdr2013/World_Drug_Report_2013.pdf
2. EMCDDA The state of the drugs problem in Europe http://www.emcdda.europa.eu/attachements.cfm/att_190854_EN_TDAC12001ENC_.pdf
3. UNODC The challenge of new psychoactive substances http://www.unodc.org/documents/scientific/NPS_2013_SMART.pdf
4. C. Steup Untersuchung des Handelsproduktes “Spice” THC PHARM GmbH http://usualredant.de/downloads/analyse-thc-pharm-spice-jwh-018.pdf
5. 'Spice' and other herbal blends: Harmless incense or cannabinoid designer drugs?;Auwärter;J. Mass Spectrom.,2009