Soong, Hui Ni, Roshartini Omar, Kai Chen Goh, and Ta Wee Seow. “The Challenges of Implementation Greywater Recycling System In Residential Buildings ”. Research in Management of Technology and Business 2, no. 1 (June 12, 2021): 1113–1129. Accessed April 7, 2026. https://penerbit.uthm.edu.my/periodicals/index.php/rmtb/article/view/2047.