Almuntadzar, Inzi, M. Syamsul Maarif, and Lukman M. Baga. “STRATEGY TO IMPROVE LABOR PRODUCTIVITY IN PT FREEPOT INDONESIA’S UNDERGROUND MINING PROJECT”. Jurnal Aplikasi Bisnis dan Manajemen (JABM) 7, no. 2 (May 31, 2021): 241. Accessed October 28, 2021. https://journal.ipb.ac.id/index.php/jabm/article/view/34774.