Ong, Eng Tek. “The Effects of an in-Service Professional Development Course on Acehnese Science teachers’ Perceived Pedagogical Knowledge and Skills”. Journal of Research, Policy & Practice of Teachers and Teacher Education 3, no. 2 (September 29, 2018): 5–16. Accessed July 22, 2024. https://ojs.upsi.edu.my/index.php/JRPPTTE/article/view/169.