Siew-Moi, P., W. Ching-Lee, L. Phaik-Eem, Y. Hui-Yin, and C. Cheong-Xin. “Seaweed Diversity of the Langkawi Islands With Emphasis on the Northeastern Region”. Malaysian Journal of Science, vol. 24, Apr. 2005, pp. 77-94, https://ejournal.um.edu.my/index.php/MJS/article/view/8823.