Gaya APA

Energy, M, O, M, A. (1987). (tidak ada) Feasibility Study Report On Ombilin Integrated Coal Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Energy, Ministry, Of, Mines, And. "(tidak ada) Feasibility Study Report On Ombilin Integrated Coal Project". Bandung: Pusat Sumber Daya Geologi, 1987. Batubara.