Mahzan, S., Ahmad Zaidi, A., Arsat, N., M. Hatta, M. N., Ghazali, M. I., & Mohideen, S. R. (2010). Study on Sound Absorption Properties of Coconut Coir Fibre Reinforced Composite with Added Recycled Rubber. International Journal of Integrated Engineering, 2(1). https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/126