RT Book T1 Systematic observation of public police: applying field research methods to policy issues A2 Mastrofski, Stephen D. LA English PP Washington, DC PB US Dep. of Justice, Office of Justice Programs, National Institute of Justice YR 1998 UL https://krimdok.uni-tuebingen.de/Record/1144859131 CN 363.20723 K1 Forschungsbericht