Che Ahmad, C. N., A. Yahaya, M. F. N. L. Abdullah, N. Mohamed Noh, M. Adnan, and N. J. Amri. “An Instrument to Assess Effect of the Physical Classroom Environment on Students”. Journal of Science and Mathematics Letters, vol. 2, Dec. 2014, pp. 1-12, https://ojs.upsi.edu.my/index.php/JSML/article/view/388.