Toma, J. J., R. S. Ahmed, and Z. K. Abdulla. “Application of Water Quality Index for Assessment Water Quality in Some Bottled Water Erbil City, Kurdistan Region, Iraq”. Advances in BioScience, vol. 4, no. 4, Oct. 2013, pp. 128-34, https://journals.sospublication.co.in/ab/article/view/139.