Chai Peng, L., & Hakif Hassan, M. (2005). Contributions from the Geology of Northeast Langkawi to Refining the Mid-Palaeozoic Stratigraphy and Palaeogeography of Peninsular Malaysia. Malaysian Journal of Science, 24, 15–23. Retrieved from https://ajap.um.edu.my/index.php/MJS/article/view/8814