Gaya APA

Project, W, C, O, C, S, C, E. (1989). Report on Detailed Exploration of Central Sumatra Coal Exploration Project Appendix II Geophysycal Log P.B. . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Project, Working, Commitee, Of, Central, Sumatera, Coal, Eksploration. "Report on Detailed Exploration of Central Sumatra Coal Exploration Project Appendix II Geophysycal Log P.B.". Bandung: Pusat Sumber Daya Geologi, 1989. Batubara.