Ahmad Muhammad Diponegoro , Erita Yuliasesti Diah Sari and Khoiruddin Bashor. “Counterproductive Behaviors Among Indonesian Students”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, Apr. 2020, pp. 4003 -10, http://sersc.org/journals/index.php/IJAST/article/view/15764.