B.Y, Kamaruzzaman, Zaleha K, Ong M.C, and Wilson K.Y.S. 2007. “Copper and Zinc in Three Dominant Brackish Water Fish Species from Paka Estuary, Terengganu, Malaysia”. Malaysian Journal of Science 26 (2):65-70. https://mjs.um.edu.my/index.php/MJS/article/view/8061.