Nicholson, T., D. F. Duncan, G. Ellis-Griffith, and A. Michimi. “Macroeconomics and Drug Use: A Review of the Literature and Hypotheses for Future Research”. International Journal of Criminology and Sociology, vol. 5, Apr. 2016, pp. 41-54, doi:10.6000/1929-4409.2016.05.04.