Angelina, E.A.N. et al. 2025. Perhitungan Jumlah Volume Tonase Batubara di PT Ansaf Inti Resources Kutai Kartanegara. Journal of Geomatics Engineering, Technology, and Science. 3, 2 (Jun. 2025), 42–47. DOI:https://doi.org/10.51967/gets.v3i2.48.