Ansahrullah, K. N. ., and F. A. Shafie. “Water Quality of Water Vending Machines in Gombak, Selangor”. MAEH Journal of Environmental Health, vol. 3, no. 2, Aug. 2021, pp. 1-6, http://jurnal.maeh4u.org.my/index.php/home/article/view/26.