RT Book T1 Private security: patterns and trends T2 Research in brief / National Institute of Justice A1 Cunningham, William C. A2 Strauchs, John J. A2 VanMeter, Clifford W. LA English PP Washington, DC PB U.S. Dep. of Justice, Office of Justice Programs, National Inst. of Justice YR 1991 UL https://krimdok.uni-tuebingen.de/Record/109727120X NO Based on Hallcrest's update and review of private security in 1990