Norazmi, Anees Arisha, and Emedya Murniwaty Samsudin. “Utilizing Cotton Bud Sticks As a Sustainable Sound Absorber”. Recent Trends in Civil Engineering and Built Environment, vol. 2, no. 1, June 2021, pp. 834-41, https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/1316.