Gaya APA

Geologi, P, S, D. (1987). Report On Preliminary Exploration Of Central Sumatra Coal Exploration Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Geologi, Pusat, Sumber, Daya. "Report On Preliminary Exploration Of Central Sumatra Coal Exploration Project". Bandung: Pusat Sumber Daya Geologi, 1987. Batubara.