Gaya APA
Energy, M, O, M, A. (1987).
Feasibility Study Report On Ombilin Integrated Coal Project .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Energy, Ministry, Of, Mines, And.
"Feasibility Study Report On Ombilin Integrated Coal Project".
Bandung:
Pusat Sumber Daya Geologi,
1987.
Logam.