Gaya APA

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

Gaya MLA

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