Bewley-Taylor, D., & Hallam, C. (2010). Mapping the world drug problem: Science and politics in the United Nations drug control system. International Journal of Drug Policy, 21(1), p. 1. doi:10.1016/j.drugpo.2009.10.007

Bewley-Taylor, David, and Christopher Hallam. "Mapping the World Drug Problem: Science and Politics in the United Nations Drug Control System." International Journal of Drug Policy 21, no. 1 (2010): 1.

Bewley-Taylor, David, and Christopher Hallam. "Mapping the World Drug Problem: Science and Politics in the United Nations Drug Control System." International Journal of Drug Policy 21.1 (2010): 1.