Cita APA (7a ed.)

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 (9a ed.)

Robinson, Jennifer Barbara. The Drug Free Zones, the Police, Locations, and Trends of Drug Sales in Portland, Oregon, 1990 - 1998. 2003.