Safie, Nurul Azmah, et al. “Water Footprint Assessment and Water-Energy-Food Nexus for Domestic and Institutional Sectors in Klang Valley, Malaysia: a Review”. International Journal of Engineering & Technology, vol. 7, no. 4.35, Nov. 2018, pp. 244-7, https://doi.org/10.14419/ijet.v7i4.35.22740.