Nayan, N., M. S. Y. Che Ngah, M. Hashim, Y. Saleh, and M. A. Shafiee. “Pemetaan Tahap Ketersampaian Wi-Fi Di Universiti Pendidikan Sultan Idris, Perak: Mapping of Wi-Fi Coverage Levels in Sultan Idris Education University, Perak”. GEOGRAFI, vol. 2, no. 2, Dec. 2018, pp. 39-51, https://ejournal.upsi.edu.my/index.php/GEOG/article/view/476.