Ratcliffe, J. (2011). The Philadelphia foot patrol experiment: A randomized controlled trial of police patrol effectiveness in violent crime hotspots. Criminology, 39(3), 795-831.
Chicago-Zitierstil (17. Ausg.)Ratcliffe, Jerry. "The Philadelphia Foot Patrol Experiment: A Randomized Controlled Trial of Police Patrol Effectiveness in Violent Crime Hotspots." Criminology 39, no. 3 (2011): 795-831.
MLA-Zitierstil (8. Ausg.)Ratcliffe, Jerry. "The Philadelphia Foot Patrol Experiment: A Randomized Controlled Trial of Police Patrol Effectiveness in Violent Crime Hotspots." Criminology, vol. 39, no. 3, 2011, pp. 795-831.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.