Gaya APA

Project, W, C, O, C, S, C, E. (1989). Report on Detailed Exploration of Central Sumatra Coal Exploration Project Appendix I Borehole Log P.A. . 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 I Borehole Log P.A.". Bandung: Pusat Sumber Daya Geologi, 1989. Encyclopaedia.