Kuok Kuok, King, and Po Chan Chiu. “Space-Saving Rainwater Harvesting Tanks for Double Story Houses in Kuching, Sarawak”. International Journal of Engineering & Technology 8, no. 1 (January 27, 2019): 38–43. Accessed April 28, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/17437.