Shobaruddin, Muhammad. “NEW CHAPTER OF DIPLOMATIC RELATION BETWEEN INDONESIA-AMERICA UNDER NEW CONTRACT OF FREEPORT-MCMORAN”. Natapraja 6, no. 1 (August 6, 2018): 1–10. Accessed May 8, 2025. https://journal.uny.ac.id/index.php/natapraja/article/view/20697.