Gaya APA

Energy, M, O, M, A. (1986). Ombilin II Coal Mine Development And Transportation Project, Conceptual Report Volume VII Project Optimization . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

Energy, Ministry, Of, Mines, And. "Ombilin II Coal Mine Development And Transportation Project, Conceptual Report Volume VII Project Optimization". Bandung: Direktorat Sumber Daya Mineral, 1986. Batubara.