Nik Daud, Nik Mohd Farhan, et al. “Penggunaan Persamaan Universal Soil Loss Equation Dalam Menganggar Hakisan Tanih Di Universiti Pendidikan Sultan Idris: Kajian Kes Kampus Sultan Azlan Shah, Proton City: The Usage of Universal Soil Loss Equation in Estimating the Soil Erosion in Universiti Pendidikan Sultan Idris: A Case Study of Sultan Azlan Shah Campus, Proton City”. GEOGRAFI, vol. 6, no. 1, Apr. 2018, pp. 41-49, https://ejournal.upsi.edu.my/index.php/GEOG/article/view/2078.