Walker, H. M., Irvin, L. K., & Sprague, J. R. (1997). Violence prevention and school safety: Issues, problems, approaches, and recommended solutions. Eugene, Ore: Oregon School Study Council.

Walker, Hill M., Larry K. Irvin, and Jeffery R. Sprague. Violence Prevention and School Safety: Issues, Problems, Approaches, and Recommended Solutions. Eugene, Ore: Oregon School Study Council, 1997.

Walker, Hill M., Larry K. Irvin, and Jeffery R. Sprague. Violence Prevention and School Safety: Issues, Problems, Approaches, and Recommended Solutions. Eugene, Ore: Oregon School Study Council, 1997.