Cita APA (7a ed.)

Parker, H., & Kirby, P. (1996). Methadone maintenance and crime reduction on Merseyside. Crime detection and prevention series.

Cita Chicago Style (17a ed.)

Parker, Howard, y Perpetua Kirby. "Methadone Maintenance and Crime Reduction on Merseyside." Crime Detection and Prevention Series 1996.

Cita MLA (9a ed.)

Parker, Howard, y Perpetua Kirby. "Methadone Maintenance and Crime Reduction on Merseyside." Crime Detection and Prevention Series, 1996.