Shamsudin, Nurul Syafiqah, et al. “Kajian Keberkesanan Penyenggaraan Fasiliti Dalam Pengurusan Sisa Pepejal Di Kawasan Program Perumahan Rakyat(PPR) Seri Pantai, Kuala Lumpur ”. Research in Management of Technology and Business, vol. 2, no. 2, Nov. 2021, pp. 357-68, https://publisher.uthm.edu.my/periodicals/index.php/rmtb/article/view/4661.