Columbia subject headings:
Criminal psychology--Case studies.
Mass murder investigation--United States.
Mass murder--United States--Case studies.
Mass murder--United States.
Harvard subject headings:
Criminal psychology--Case studies
Mass murder investigation--United States.
Mass murder--United States--Case studies.
Mass murder--United States.
Princeton subject headings:
Case studies.
Criminal psychology--Case studies.
Mass murder--United States--Case studies.
Mass murder--United States--Investigation.
Mass murder--United States.