Robinson, J. B. (2003). The drug free zones, the police, locations, and trends of drug sales in Portland, Oregon, 1990 - 1998.
Cita Chicago Style (17a ed.)Robinson, Jennifer Barbara. The Drug Free Zones, the Police, Locations, and Trends of Drug Sales in Portland, Oregon, 1990 - 1998. 2003.
Cita MLA (8a ed.)Robinson, Jennifer Barbara. The Drug Free Zones, the Police, Locations, and Trends of Drug Sales in Portland, Oregon, 1990 - 1998. 2003.
Precaución: Estas citas no son 100% exactas.