Roberts, L. L. (1981). An analysis of fatal assaults upon law enforcement officers which occurred in the United States from 1972 through 1978. Univ. Microfilms Internat.
Chicago-Zitierstil (17. Ausg.)Roberts, Larry L. An Analysis of Fatal Assaults upon Law Enforcement Officers Which Occurred in the United States from 1972 Through 1978. Ann Arbor, Mich: Univ. Microfilms Internat, 1981.
MLA-Zitierstil (8. Ausg.)Roberts, Larry L. An Analysis of Fatal Assaults upon Law Enforcement Officers Which Occurred in the United States from 1972 Through 1978. Univ. Microfilms Internat, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.