Gaya APA

Geologi, P, S, D. (1988). Report On Semi Detailed Exploration Of Central Sumatra Coal Exploration Project, Appendix IV Report On Coal Analyses . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Geologi, Pusat, Sumber, Daya. "Report On Semi Detailed Exploration Of Central Sumatra Coal Exploration Project, Appendix IV Report On Coal Analyses". Bandung: Pusat Sumber Daya Geologi, 1988. Batubara.