RT Article T1 Visible school security measures across diverse middle and high school settings: Typologies and predictors JF Journal of applied security research VO 11 IS 4 SP 422 OP 436 A1 Steinka-Fry, Katarzyna T. A2 Tanner-Smith, Emily E. A2 Fisher, Benjamin W. LA English YR 2016 UL https://krimdok.uni-tuebingen.de/Record/1912745216 DO 10.1080/19361610.2016.1210482