และหีม เ. “The Effect of Group Study Activities on the Prevention Risky Behavior to Students’ Bullying in an Islamic Private School, Yala Province”. Parichart Journal, vol. 31, no. 1, Apr. 2018, pp. 183-00, https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/118914.