Gaya APA

Energy, M, O, M, A., Mines, D, G, O. (1985). Ombilin II Coal Mine Development And Trasportation Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Energy, Ministry, Of, Mines, And., Mines, Directorate, General, Of. "Ombilin II Coal Mine Development And Trasportation Project". Bandung: Pusat Sumber Daya Geologi, 1985. Batubara.