Ching, W. C., and C. N. Che Ahmad. “Investigation of Constructivist Learning Enviroments and Educational Facility in Science Classrooms: Kajian Pengintegrasian Persekitaran Pembelajaran Konstruktivis Dan Kemudahan Pendidikan Dalam Bilik Darjah Sains”. Journal of Science and Mathematics Letters, vol. 1, Dec. 2013, pp. 18-27, https://ejournal.upsi.edu.my/index.php/JSML/article/view/4303.