Harjani, C., and P. P. Noviandri. “SOUND PROOFING PANEL MADE FROM PATCHWORK AND GYPSUM AS A GREEN MATERIAL INNOVATION”. SMART: Seminar on Architecture Research and Technology, vol. 3, Mar. 2019, pp. 111-8, https://smartfad.ukdw.ac.id/index.php/smart/article/view/24.