Heo, Ruoh Jau, and Roslinda Ali. 2024. “Household Waste Separation and 3R Practice: Comparison Between the Urban and Rural Communities in Ipoh, Perak”. Progress in Engineering Application and Technology 5 (2): 751-59. https://penerbit.uthm.edu.my/periodicals/index.php/peat/article/view/14378.