Ahmad Safian, A. H., A. Robani, and M. Sedek. “The Motivations and Barriers of Teachers’ Professional Development Activities During the Movement Control Order (MCO) – A Preliminary Insight”. International Journal of Learning, Teaching and Educational Research, vol. 20, no. 11, Nov. 2021, pp. 42-56, http://www.ijlter.net/index.php/ijlter/article/view/719.