Barzani Gasim, M., an N. A. Sulaiman, M. Ismail Yaziz, and bd. R. Samsudin. “Characteristics of Hydrological Variables of the Semenyih River Basin, Selangor, Malaysia”. Malaysian Journal of Science, vol. 24, no. 2, Aug. 2005, pp. 18-21, http://mojes.um.edu.my/index.php/MJS/article/view/8302.