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 Style (17th ed.) CitationRoberts, 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 (8th ed.) CitationRoberts, 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.
Warning: These citations may not always be 100% accurate.