Gaya APA

INTERNATIONAL, C, D, F. (1983). Ombilin II Coal Mine Development And Transpotation Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

INTERNATIONAL, CHARBONAGES, DE, FRANCE. "Ombilin II Coal Mine Development And Transpotation Project". Bandung: Pusat Sumber Daya Geologi, 1983. Batubara.