Riyanto, Erwin, Noer Azam Achsani, and Moch Hadi Santoso. “MODEL EFFECT OF COPPER PRICE ON FREEPORT MCMORAN STOCK PRICE”. Jurnal Aplikasi Bisnis dan Manajemen (JABM) 7, no. 3 (September 28, 2021): 535. Accessed October 4, 2022. https://jma.journal.ipb.ac.id/index.php/jabm/article/view/35026.