1. Acosta, Luisa María. 2019. “Resurgence of Coca in Putamayo Reflects Colombia’s Failed Strategy.” InSight Crime, July12. Accessed September 6, 2019. https://www.insightcrime.org/news/analysis/resurgence-coca-putumayo-colombia-failed-strategy/.
2. Arter, Melanie. 2016. “State Department Official: Cocaine Consumption Down More Than 50 Percent, ‘But Heroin Abuse Is Exploding’.” CNSNews.com, June16. Accessed October 21, 2018. https://www.cnsnews.com/news/article/melanie-hunter/state-department-official-cocaine-consumption-down-more-50-percent.