N. A. Majid, R. Rainis, and W. M. M. Wan Ibrahim, “Pemodelan Ruangan Pelbagai Jenis Kegagalan Cerun di Pulau Pinang Menggunakan Kaedah Nisbah Kekerapan: Spatial Modeling of Various Slope Failures in Pulau Pinang Using Frequency Ratio Method”, GEOG, vol. 5, no. 2, pp. 13–26, Oct. 2017, Accessed: Apr. 09, 2025. [Online]. Available: https://ejournal.upsi.edu.my/index.php/GEOG/article/view/2044