Wong, R. C., M. L. Liew, and C. F. Chan. “Distribution of Polycyclic Aromatic Hydrocarbons (PAHs) Found in Water Along the Northern Straits of Malacca”. Malaysian Journal of Science, vol. 27, no. 3, Dec. 2008, pp. 19-24, https://juku.um.edu.my/index.php/MJS/article/view/7705.