et al., Seng Tong Chong. “Assessing Environmental Education through KBSM Social Sciences Subjects: Three Case Studies”. International Journal of Advanced Science and Technology 28, no. 10 (October 19, 2019): 285 - 292. Accessed February 23, 2026. http://sersc.org/journals/index.php/IJAST/article/view/1023.