M.A. Suhaimi, M.A.A. Rahman, M. Awang, Z.A.Akasah, and N. Hashim. “Problems Associated With Indoor Air Quality (IAQ) in Classroom and Recommended Approaches”. Politeknik & Kolej Komuniti Journal of Social Sciences and Humanities, vol. 1, no. 1, Nov. 2018, pp. 24-30, https://app.mypolycc.edu.my/journal/index.php/PMJSSH/article/view/129.