@article{ref1, title="The Lessons of Columbine, Part I", journal="American behavioral scientist", year="2009", author="Muschert, G. W. and Spencer, J. W.", volume="52", number="9", pages="1223-1226", abstract="

[Abstract unavailable]

", language="", issn="0002-7642", doi="10.1177/0002764209332550", url="http://dx.doi.org/10.1177/0002764209332550" }