HaeDong Kim, Carlson J, Sydney Nelson. Towards a three-dimensional hardening of schools to promote effective school safety practices in the United States: A systematic review. ASSRJ [Internet]. 2021Aug.17 [cited 2024Dec.1];8(8):147-62. Available from: http://804474.wannyin.cyou/index.php/ASSRJ/article/view/10614