Abdul Rahim, Sahibin, Zulfahmi Ali Rahman, Tukimat Lihan, Ramlan Omar, Azman Hashim, Prihatino E, and Lai K.M. 2006. “Heavy Metals in Topsoil under Selected Vegetable Cultivation Areas in Cameron Highlands, Pahang, Malaysia”. Malaysian Journal of Science 25 (1):31-43. https://samudera.um.edu.my/index.php/MJS/article/view/8174.