Gaya APA

Energy, M, O, M, A., Mines, D, G, O. (1986). Ombillin II Coal Mine Development And Transportation Project Quarterly Repor . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Energy, Ministry, Of, Mines, And., Mines, Directorate, General, Of. "Ombillin II Coal Mine Development And Transportation Project Quarterly Repor". Bandung: Pusat Sumber Daya Geologi, 1986. Batubara.