Hussin, Azhar, Dorall, Richard, Meor H.H, and Gokilan, S. “The Physical Geography and Geology of Northeast Langkawi”. Malaysian Journal of Science 24 (April 28, 2005): 1–8. Accessed December 19, 2024. https://mjs.um.edu.my/index.php/MJS/article/view/8811.