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.
Cita Chicago Style (17a ed.)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.
Cita MLA (8a ed.)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.
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