Febrian, S. et al. 2022. THE EFFECT OF USING MULTI LAYER MATERIAL ON DIESEL ENGINE SOUND ABSORBER CASE. Jurnal Sains & Teknologi Fakultas Teknik Universitas Darma Persada. 12, 2 (Sep. 2022), 72–77. DOI:https://doi.org/10.70746/jstunsada.v12i2.251.