School Shooter: A Quick Reference Guide. United States. Federal Bureau of Investigation National Center for the Analysis of Violent Crimes (U.S.). January 1969 [2023-03-29]. (原始内容存档于2019-03-27).
School Shooter: A Quick Reference Guide. United States. Federal Bureau of Investigation National Center for the Analysis of Violent Crimes (U.S.). January 1969 [2023-03-29]. (原始内容存档于2019-03-27).