Ramlan Mustapha, S. N. I. Z. A. “The Practice of Professional Learning Community in Trust Schools, Transformation Schools and High Performing Schools in Selangor Malaysia”. International Journal of Advanced Science and Technology, Vol. 28, no. 16, Dec. 2019, pp. 1853 -, http://sersc.org/journals/index.php/IJAST/article/view/2439.