Astor, R.A. Meyer, H.A. And Behre, W.J. (1999). Unowned places and times: Maps and interviews about violence in high schools. American Educational Research Journal, Vol. 36, No. 1, 3-42.
Crowe, T.D. (1990). Designing safer schools. School Safety. 43-47.
Jenkins, P.H.(1997). School delinquency and the school social bond. Journal of Research in Crime and Delinquency, Vol. 34 No. 3, 337-367.
May, D.C. (September 1999). Scared kids, unattached kids, or peer pressure: Why do students carry firearms to school? Youth & Society, Vol. 31 No. 1, 100-127.