Kamarulzaman, Wirawani, and Rosnani Hashim. “Primary School Teachers’ Understanding of Critical Thinking in KSSR Classroom and Its Importance to Students”. International Journal of Engineering & Technology, vol. 7, no. 4.15, Oct. 2018, pp. 530-5, https://doi.org/10.14419/ijet.v7i4.15.28108.