Gaya APA

Geologi, P, S, D. (1988). (tidak ada) Report On Semi Detailed Exploration Of Central Sumatra Coal Exploration Project, Appendix III Coal Outcrop Sketch . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Geologi, Pusat, Sumber, Daya. "(tidak ada) Report On Semi Detailed Exploration Of Central Sumatra Coal Exploration Project, Appendix III Coal Outcrop Sketch". Bandung: Pusat Sumber Daya Geologi, 1988. Logam.