Silalahi, Hotma, Lina Fathimahhayati, and Willy Tambunan. “Analisis Beban Kerja Mental Dan Fisik Operator HD Komatsu 785-7”. ARIKA 15, no. 1 (February 28, 2021): 37-50. Accessed May 5, 2024. https://ojs3.unpatti.ac.id/index.php/arika/article/view/3063.