Tambun, J. M. ., M. F. Pasaribu, and A. A. Syarif. “Work Environment Analysis Based on Production Machine Noise Levels at PT. Grahadura Leidong Prima”. IRA Jurnal Teknik Mesin Dan Aplikasinya (IRAJTMA), vol. 2, no. 1, May 2023, pp. 24-33, doi:10.56862/irajtma.v2i1.36.