Chin, Wen Jun, Kai Sheng See, Yu Han Ng, Jie Ling Gan, and Sing Yee Lim. “Technologies for Indoor Noise Attenuation: A Short Review”. Progress in Energy and Environment 9 (July 6, 2019): 1–10. Accessed May 5, 2024. https://www.akademiabaru.com/submit/index.php/progee/article/view/1053.