“Investasi Dan Analisis Kelayakan Ekonomi Pertambangan Batubara PT. Adimitra Baratama Nusantara Di Kalimantan Timur”. Jurnal Geologi Pertambangan (JGP) 26, no. 1 (January 5, 2020). Accessed August 24, 2025. https://ejurnal.unikarta.ac.id/index.php/jgp/article/view/754.