R Sivakumar, Ganahcan Nair, and Muhd Hafeez Zainulabidin. “Acoustic Performance of Upcycled Materials: Plastics & Cigarette Buds in Laminate Composites”. Research Progress in Mechanical and Manufacturing Engineering, vol. 5, no. 1, Oct. 2024, pp. 130-9, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/15852.