Puspitacandri, Ardhiana, and Yoyok Soesatyo. “Influence Of Class Climate Perception And Self-Efficacy On Student Engagement (A Case Study at Taruna Surabaya Shipbuilding Polytechnic)”. Journal of Education, Health and Sport, vol. 9, no. 4, Apr. 2019, pp. 479-91, https://apcz.umk.pl/JEHS/article/view/6850.