Ayob, Zulkefle, Suriati Ahmad, and Ibrahim Abdallah Shinbira. “Criteria for Sustainable Landscape Maintenance: Addressing Cost Implication”. Environment-Behaviour Proceedings Journal 7, no. 20 (June 30, 2022): 315–322. Accessed March 29, 2024. https://ebpj.e-iph.co.uk/index.php/EBProceedings/article/view/3316.