Soong, H. N., Omar, R., Goh, . K. C., & Seow , T. W. (2021). The Challenges of Implementation Greywater Recycling System In Residential Buildings . Research in Management of Technology and Business, 2(1), 1113-1129. https://publisher.uthm.edu.my/periodicals/index.php/rmtb/article/view/2047