Setiyowati, Ernaning, Hanif Alfanani, Enita C. Nisa, and Siti Aisyah. “The Capability of Multi-Layer Material of A Pitched Roof in Reducing Noises”. International Journal of Engineering and Technology 8, no. 1.9 (January 26, 2019): 594–597. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/30067.