Sakke, N., H. Ithnin, A. Saudi, and M. T. Mapa. “Keparahan Kemarau Hidrologi Di Lembangan Sungai Lui, Hulu Langat Selangor: Severity of Hydrological Drought in the Lui River Basin, Hulu Langat, Selangor”. GEOGRAFI, vol. 4, no. 1, Apr. 2016, pp. 11-24, https://ejournal.upsi.edu.my/index.php/GEOG/article/view/1907.