Ibrahim, M. H., J. M. Jahi, and A. S. Hadi. “Variasi Rentasan Suhudi Bandaraya Ipoh, Perak, Malaysia: Temperature Variations in Ipoh City, Perak, Malaysia”. Perspektif Jurnal Sains Sosial Dan Kemanusiaan, vol. 5, no. 3, Dec. 2013, pp. 80-91, https://ejournal.upsi.edu.my/index.php/PERS/article/view/1648.