Cicero T. J. The Changing Face of Heroin Use in the United States // JAMA Psychiatry. 71 (7). (2014) на http://www.ncbi.nlm.nih.gov/pubmed/24871348.
92
Васа R. Chart: Colorado Marijuana Sales Hit $700 Million in 2014 // Cannabist. February 12, 2015 на http://www.thecannabist.co/2015/02/12/colorado-marijuana-sales-2014-700-million/27565.