Gaya APA

Geologi, P, S, D. (1999). Proyek integrated Study For Coal Development In Central Part Of Sumatera' CTA-231 . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Geologi, Pusat, Sumber, Daya. "Proyek integrated Study For Coal Development In Central Part Of Sumatera' CTA-231". Bandung: Pusat Sumber Daya Geologi, 1999. Batubara.