“IDENTIFIKASI PERSEPSI DAN SIKAP TERHADAP KESELAMATAN KERJA DI PERTAMBANGAN TIMAH INDONESIA”. Machine : Jurnal Teknik Mesin 3, no. 1 (January 2, 2017): 21–29. Accessed September 17, 2026. https://www.journal.ubb.ac.id/index.php/machine/article/view/473.